diff --git a/tests/lwip_sock_ip/constants.h b/tests/lwip_sock_ip/constants.h
index b6a6565414faac71cfcd8fd197b5546dc15d819b..352a0edd9470d17933338d6627888aa773eba6ba 100644
--- a/tests/lwip_sock_ip/constants.h
+++ b/tests/lwip_sock_ip/constants.h
@@ -28,10 +28,19 @@ extern "C" {
 #define _TEST_PROTO         (254) /* https://tools.ietf.org/html/rfc3692#section-2.1 */
 #define _TEST_NETIF         (1)
 #define _TEST_TIMEOUT       (1000000U)
-#define _TEST_ADDR4_LOCAL   (0xc0a84f96U)   /* 192.168.79.150 */
-#define _TEST_ADDR4_REMOTE  (0xc0a84f6bU)   /* 192.168.79.107 */
-#define _TEST_ADDR4_WRONG   (0x254c6b4cU)
-#define _TEST_ADDR4_MASK    (0xffffff00U)   /* 255.255.255.0 */
+#if __BYTE_ORDER__ == __ORDER_LITTLE_ENDIAN__
+# define _TEST_ADDR4_LOCAL  (0x964fa8c0U)   /* 192.168.79.150 */
+# define _TEST_ADDR4_REMOTE (0x6b4fa8c0U)   /* 192.168.79.107 */
+# define _TEST_ADDR4_WRONG  (0x4c6b4c25U)
+# define _TEST_ADDR4_MASK   (0x00ffffffU)   /* 255.255.255.0 */
+#elif __BYTE_ORDER__ == __ORDER_BIG_ENDIAN__
+# define _TEST_ADDR4_LOCAL  (0xc0a84f96U)   /* 192.168.79.150 */
+# define _TEST_ADDR4_REMOTE (0xc0a84f6bU)   /* 192.168.79.107 */
+# define _TEST_ADDR4_WRONG  (0x254c6b4cU)
+# define _TEST_ADDR4_MASK   (0xffffff00U)   /* 255.255.255.0 */
+#else
+# error "Byte order is neither little nor big!"
+#endif
 #define _TEST_ADDR4_GW      (0UL)           /* so we can test unreachability */
 #define _TEST_ADDR6_LOCAL   { 0x2f, 0xc4, 0x11, 0x5a, 0xe6, 0x91, 0x8d, 0x5d, \
                               0x8c, 0xd1, 0x47, 0x07, 0xb7, 0x6f, 0x9b, 0x48 }
diff --git a/tests/lwip_sock_ip/main.c b/tests/lwip_sock_ip/main.c
index c0e95dc9bb3e8ab46946774d1dc64a43c2aa64db..638ca9057b4fd42dc1c65c0a0aefdbcc05ff4f32 100644
--- a/tests/lwip_sock_ip/main.c
+++ b/tests/lwip_sock_ip/main.c
@@ -66,9 +66,9 @@ static void test_sock_ip_create4__EINVAL_addr(void)
 static void test_sock_ip_create4__EINVAL_netif(void)
 {
     static const sock_ip_ep_t local = { .family = AF_INET, .netif = _TEST_NETIF };
-    const sock_ip_ep_t remote = { .family = AF_INET,
+    static const sock_ip_ep_t remote = { .family = AF_INET,
                                          .netif = (_TEST_NETIF + 1),
-                                         .addr = { .ipv4_u32 = htonl(_TEST_ADDR4_REMOTE) } };
+                                         .addr = { .ipv4_u32 = _TEST_ADDR4_REMOTE } };
 
     assert(-EINVAL == sock_ip_create(&_sock, &local, &remote, _TEST_PROTO,
                                      SOCK_FLAGS_REUSE_EP));
@@ -122,8 +122,8 @@ static void test_sock_ip_create4__only_local_reuse_ep(void)
 
 static void test_sock_ip_create4__only_remote(void)
 {
-    const sock_ip_ep_t remote = { .family = AF_INET,
-                                         .addr = { .ipv4_u32 = htonl(_TEST_ADDR4_REMOTE) } };
+    static const sock_ip_ep_t remote = { .family = AF_INET,
+                                         .addr = { .ipv4_u32 = _TEST_ADDR4_REMOTE } };
     sock_ip_ep_t ep;
 
     assert(0 == sock_ip_create(&_sock, NULL, &remote, _TEST_PROTO,
@@ -132,15 +132,15 @@ static void test_sock_ip_create4__only_remote(void)
     assert(0 == sock_ip_get_local(&_sock, &ep));
     assert(0 == sock_ip_get_remote(&_sock, &ep));
     assert(AF_INET == ep.family);
-    assert(htonl(_TEST_ADDR4_REMOTE) == ep.addr.ipv4_u32);
+    assert(_TEST_ADDR4_REMOTE == ep.addr.ipv4_u32);
     assert(SOCK_ADDR_ANY_NETIF == ep.netif);
 }
 
 static void test_sock_ip_create4__full(void)
 {
     static const sock_ip_ep_t local = { .family = AF_INET, .netif = _TEST_NETIF };
-    const sock_ip_ep_t remote = { .family = AF_INET,
-                                         .addr = { .ipv4_u32 = htonl(_TEST_ADDR4_REMOTE) } };
+    static const sock_ip_ep_t remote = { .family = AF_INET,
+                                         .addr = { .ipv4_u32 = _TEST_ADDR4_REMOTE } };
     sock_ip_ep_t ep;
 
     assert(0 == sock_ip_create(&_sock, &local, &remote, _TEST_PROTO,
@@ -152,7 +152,7 @@ static void test_sock_ip_create4__full(void)
     assert(_TEST_NETIF == ep.netif);
     assert(0 == sock_ip_get_remote(&_sock, &ep));
     assert(AF_INET == ep.family);
-    assert(htonl(_TEST_ADDR4_REMOTE) == ep.addr.ipv4_u32);
+    assert(_TEST_ADDR4_REMOTE == ep.addr.ipv4_u32);
     assert(SOCK_ADDR_ANY_NETIF == ep.netif);
 }
 
@@ -205,7 +205,7 @@ static void test_sock_ip_recv4__ETIMEDOUT(void)
 static void test_sock_ip_recv4__socketed(void)
 {
     static const sock_ip_ep_t local = { .family = AF_INET };
-    const sock_ip_ep_t remote = { .addr = { .ipv4_u32 = htonl(_TEST_ADDR4_REMOTE) },
+    static const sock_ip_ep_t remote = { .addr = { .ipv4_u32 = _TEST_ADDR4_REMOTE },
                                          .family = AF_INET };
 
     assert(0 == sock_ip_create(&_sock, &local, &remote, _TEST_PROTO,
@@ -220,7 +220,7 @@ static void test_sock_ip_recv4__socketed(void)
 static void test_sock_ip_recv4__socketed_with_remote(void)
 {
     static const sock_ip_ep_t local = { .family = AF_INET };
-    const sock_ip_ep_t remote = { .addr = { .ipv4_u32 = htonl(_TEST_ADDR4_REMOTE) },
+    static const sock_ip_ep_t remote = { .addr = { .ipv4_u32 = _TEST_ADDR4_REMOTE },
                                          .family = AF_INET };
     sock_ip_ep_t result;
 
@@ -231,14 +231,14 @@ static void test_sock_ip_recv4__socketed_with_remote(void)
     assert(sizeof("ABCD") == sock_ip_recv(&_sock, _test_buffer,
                                           sizeof(_test_buffer), 0, &result));
     assert(AF_INET == result.family);
-    assert(htonl(_TEST_ADDR4_REMOTE) == result.addr.ipv4_u32);
+    assert(_TEST_ADDR4_REMOTE == result.addr.ipv4_u32);
     assert(_TEST_NETIF == result.netif);
     assert(_check_net());
 }
 
 static void test_sock_ip_recv4__unsocketed(void)
 {
-    const sock_ip_ep_t local = { .addr = { .ipv4_u32 = htonl(_TEST_ADDR4_LOCAL) },
+    static const sock_ip_ep_t local = { .addr = { .ipv4_u32 = _TEST_ADDR4_LOCAL },
                                         .family = AF_INET };
 
     assert(0 == sock_ip_create(&_sock, &local, NULL, _TEST_PROTO,
@@ -262,7 +262,7 @@ static void test_sock_ip_recv4__unsocketed_with_remote(void)
     assert(sizeof("ABCD") == sock_ip_recv(&_sock, _test_buffer,
                                           sizeof(_test_buffer), 0, &result));
     assert(AF_INET == result.family);
-    assert(htonl(_TEST_ADDR4_REMOTE) == result.addr.ipv4_u32);
+    assert(_TEST_ADDR4_REMOTE == result.addr.ipv4_u32);
     assert(_TEST_NETIF == result.netif);
     assert(_check_net());
 }
@@ -280,7 +280,7 @@ static void test_sock_ip_recv4__with_timeout(void)
                                           sizeof(_test_buffer), _TEST_TIMEOUT,
                                           &result));
     assert(AF_INET == result.family);
-    assert(htonl(_TEST_ADDR4_REMOTE) == result.addr.ipv4_u32);
+    assert(_TEST_ADDR4_REMOTE == result.addr.ipv4_u32);
     assert(_TEST_NETIF == result.netif);
     assert(_check_net());
 }
@@ -297,14 +297,14 @@ static void test_sock_ip_recv4__non_blocking(void)
     assert(sizeof("ABCD") == sock_ip_recv(&_sock, _test_buffer,
                                           sizeof(_test_buffer), 0, &result));
     assert(AF_INET == result.family);
-    assert(htonl(_TEST_ADDR4_REMOTE) == result.addr.ipv4_u32);
+    assert(_TEST_ADDR4_REMOTE == result.addr.ipv4_u32);
     assert(_TEST_NETIF == result.netif);
     assert(_check_net());
 }
 
 static void test_sock_ip_send4__EAFNOSUPPORT(void)
 {
-    const sock_ip_ep_t remote = { .addr = { .ipv4_u32 = htonl(_TEST_ADDR4_REMOTE) },
+    static const sock_ip_ep_t remote = { .addr = { .ipv4_u32 = _TEST_ADDR4_REMOTE },
                                          .family = AF_UNSPEC };
 
     assert(-EAFNOSUPPORT == sock_ip_send(NULL, "ABCD", sizeof("ABCD"),
@@ -314,7 +314,7 @@ static void test_sock_ip_send4__EAFNOSUPPORT(void)
 
 static void test_sock_ip_send4__EINVAL_addr(void)
 {
-    const sock_ip_ep_t local = { .addr = { .ipv4_u32 = htonl(_TEST_ADDR4_LOCAL) },
+    static const sock_ip_ep_t local = { .addr = { .ipv4_u32 = _TEST_ADDR4_LOCAL },
                                         .family = AF_INET,
                                         .netif = _TEST_NETIF };
     static const sock_ip_ep_t remote = { .family = AF_INET,
@@ -329,10 +329,10 @@ static void test_sock_ip_send4__EINVAL_addr(void)
 
 static void test_sock_ip_send4__EINVAL_netif(void)
 {
-    const sock_ip_ep_t local = { .addr = { .ipv4_u32 = htonl(_TEST_ADDR4_LOCAL) },
+    static const sock_ip_ep_t local = { .addr = { .ipv4_u32 = _TEST_ADDR4_LOCAL },
                                         .family = AF_INET,
                                         .netif = _TEST_NETIF };
-    const sock_ip_ep_t remote = { .addr = { .ipv4_u32 = htonl(_TEST_ADDR4_REMOTE) },
+    static const sock_ip_ep_t remote = { .addr = { .ipv4_u32 = _TEST_ADDR4_REMOTE },
                                          .family = AF_INET,
                                          .netif = _TEST_NETIF + 1 };
 
@@ -345,7 +345,7 @@ static void test_sock_ip_send4__EINVAL_netif(void)
 
 static void test_sock_ip_send4__EHOSTUNREACH(void)
 {
-    const sock_ip_ep_t remote = { .addr = { .ipv4_u32 = htonl(_TEST_ADDR4_WRONG) },
+    static const sock_ip_ep_t remote = { .addr = { .ipv4_u32 = _TEST_ADDR4_WRONG },
                                          .family = AF_INET };
 
     assert(-EHOSTUNREACH == sock_ip_send(NULL, "ABCD", sizeof("ABCD"), _TEST_PROTO,
@@ -363,7 +363,7 @@ static void test_sock_ip_send4__ENOTCONN(void)
 
 static void test_sock_ip_send4__socketed_no_local_no_netif(void)
 {
-    const sock_ip_ep_t remote = { .addr = { .ipv4_u32 = htonl(_TEST_ADDR4_REMOTE) },
+    static const sock_ip_ep_t remote = { .addr = { .ipv4_u32 = _TEST_ADDR4_REMOTE },
                                          .family = AF_INET };
 
     assert(0 == sock_ip_create(&_sock, NULL, &remote, _TEST_PROTO,
@@ -378,9 +378,9 @@ static void test_sock_ip_send4__socketed_no_local_no_netif(void)
 
 static void test_sock_ip_send4__socketed_no_netif(void)
 {
-    const sock_ip_ep_t local = { .addr = { .ipv4_u32 = htonl(_TEST_ADDR4_LOCAL) },
+    static const sock_ip_ep_t local = { .addr = { .ipv4_u32 = _TEST_ADDR4_LOCAL },
                                         .family = AF_INET };
-    const sock_ip_ep_t remote = { .addr = { .ipv4_u32 = htonl(_TEST_ADDR4_REMOTE) },
+    static const sock_ip_ep_t remote = { .addr = { .ipv4_u32 = _TEST_ADDR4_REMOTE },
                                          .family = AF_INET };
 
     assert(0 == sock_ip_create(&_sock, &local, &remote, _TEST_PROTO,
@@ -395,7 +395,7 @@ static void test_sock_ip_send4__socketed_no_netif(void)
 
 static void test_sock_ip_send4__socketed_no_local(void)
 {
-    const sock_ip_ep_t remote = { .addr = { .ipv4_u32 = htonl(_TEST_ADDR4_REMOTE) },
+    static const sock_ip_ep_t remote = { .addr = { .ipv4_u32 = _TEST_ADDR4_REMOTE },
                                          .family = AF_INET,
                                          .netif = _TEST_NETIF };
 
@@ -411,10 +411,10 @@ static void test_sock_ip_send4__socketed_no_local(void)
 
 static void test_sock_ip_send4__socketed(void)
 {
-    const sock_ip_ep_t local = { .addr = { .ipv4_u32 = htonl(_TEST_ADDR4_LOCAL) },
+    static const sock_ip_ep_t local = { .addr = { .ipv4_u32 = _TEST_ADDR4_LOCAL },
                                         .family = AF_INET,
                                         .netif = _TEST_NETIF };
-    const sock_ip_ep_t remote = { .addr = { .ipv4_u32 = htonl(_TEST_ADDR4_REMOTE) },
+    static const sock_ip_ep_t remote = { .addr = { .ipv4_u32 = _TEST_ADDR4_REMOTE },
                                          .family = AF_INET };
 
     assert(0 == sock_ip_create(&_sock, &local, &remote, _TEST_PROTO,
@@ -429,12 +429,12 @@ static void test_sock_ip_send4__socketed(void)
 
 static void test_sock_ip_send4__socketed_other_remote(void)
 {
-    const sock_ip_ep_t local = { .addr = { .ipv4_u32 = htonl(_TEST_ADDR4_LOCAL) },
+    static const sock_ip_ep_t local = { .addr = { .ipv4_u32 = _TEST_ADDR4_LOCAL },
                                         .family = AF_INET,
                                         .netif = _TEST_NETIF };
-    const sock_ip_ep_t sock_remote = { .addr = { .ipv4_u32 = htonl(_TEST_ADDR4_WRONG) },
+    static const sock_ip_ep_t sock_remote = { .addr = { .ipv4_u32 = _TEST_ADDR4_WRONG },
                                               .family = AF_INET };
-    const sock_ip_ep_t remote = { .addr = { .ipv4_u32 = htonl(_TEST_ADDR4_REMOTE) },
+    static const sock_ip_ep_t remote = { .addr = { .ipv4_u32 = _TEST_ADDR4_REMOTE },
                                          .family = AF_INET };
 
     assert(0 == sock_ip_create(&_sock, &local, &sock_remote, _TEST_PROTO,
@@ -449,7 +449,7 @@ static void test_sock_ip_send4__socketed_other_remote(void)
 
 static void test_sock_ip_send4__unsocketed_no_local_no_netif(void)
 {
-    const sock_ip_ep_t remote = { .addr = { .ipv4_u32 = htonl(_TEST_ADDR4_REMOTE) },
+    static const sock_ip_ep_t remote = { .addr = { .ipv4_u32 = _TEST_ADDR4_REMOTE },
                                          .family = AF_INET };
 
     assert(0 == sock_ip_create(&_sock, NULL, NULL, _TEST_PROTO,
@@ -464,9 +464,9 @@ static void test_sock_ip_send4__unsocketed_no_local_no_netif(void)
 
 static void test_sock_ip_send4__unsocketed_no_netif(void)
 {
-    const sock_ip_ep_t local = { .addr = { .ipv4_u32 = htonl(_TEST_ADDR4_LOCAL) },
+    static const sock_ip_ep_t local = { .addr = { .ipv4_u32 = _TEST_ADDR4_LOCAL },
                                         .family = AF_INET };
-    const sock_ip_ep_t remote = { .addr = { .ipv4_u32 = htonl(_TEST_ADDR4_REMOTE) },
+    static const sock_ip_ep_t remote = { .addr = { .ipv4_u32 = _TEST_ADDR4_REMOTE },
                                          .family = AF_INET };
 
     assert(0 == sock_ip_create(&_sock, &local, NULL, _TEST_PROTO,
@@ -481,7 +481,7 @@ static void test_sock_ip_send4__unsocketed_no_netif(void)
 
 static void test_sock_ip_send4__unsocketed_no_local(void)
 {
-    const sock_ip_ep_t remote = { .addr = { .ipv4_u32 = htonl(_TEST_ADDR4_REMOTE) },
+    static const sock_ip_ep_t remote = { .addr = { .ipv4_u32 = _TEST_ADDR4_REMOTE },
                                          .family = AF_INET,
                                          .netif = _TEST_NETIF };
 
@@ -497,10 +497,10 @@ static void test_sock_ip_send4__unsocketed_no_local(void)
 
 static void test_sock_ip_send4__unsocketed(void)
 {
-    const sock_ip_ep_t local = { .addr = { .ipv4_u32 = htonl(_TEST_ADDR4_LOCAL) },
+    static const sock_ip_ep_t local = { .addr = { .ipv4_u32 = _TEST_ADDR4_LOCAL },
                                         .family = AF_INET,
                                         .netif = _TEST_NETIF };
-    const sock_ip_ep_t remote = { .addr = { .ipv4_u32 = htonl(_TEST_ADDR4_REMOTE) },
+    static const sock_ip_ep_t remote = { .addr = { .ipv4_u32 = _TEST_ADDR4_REMOTE },
                                          .family = AF_INET };
 
     assert(0 == sock_ip_create(&_sock, &local, NULL, _TEST_PROTO,
@@ -515,7 +515,7 @@ static void test_sock_ip_send4__unsocketed(void)
 
 static void test_sock_ip_send4__no_sock_no_netif(void)
 {
-    const sock_ip_ep_t remote = { .addr = { .ipv4_u32 = htonl(_TEST_ADDR4_REMOTE) },
+    static const sock_ip_ep_t remote = { .addr = { .ipv4_u32 = _TEST_ADDR4_REMOTE },
                                          .family = AF_INET };
 
     assert(sizeof("ABCD") == sock_ip_send(NULL, "ABCD", sizeof("ABCD"),
@@ -528,7 +528,7 @@ static void test_sock_ip_send4__no_sock_no_netif(void)
 
 static void test_sock_ip_send4__no_sock(void)
 {
-    const sock_ip_ep_t remote = { .addr = { .ipv4_u32 = htonl(_TEST_ADDR4_REMOTE) },
+    static const sock_ip_ep_t remote = { .addr = { .ipv4_u32 = _TEST_ADDR4_REMOTE },
                                          .family = AF_INET,
                                          .netif = _TEST_NETIF };
 
diff --git a/tests/lwip_sock_ip/stack.c b/tests/lwip_sock_ip/stack.c
index 7dfd18879e27b8409038222c114ab8b7e3ab4894..0cbe29ec44dc8c8b126ae72e808eaa451e936123 100644
--- a/tests/lwip_sock_ip/stack.c
+++ b/tests/lwip_sock_ip/stack.c
@@ -189,9 +189,9 @@ void _net_init(void)
     assert(netdev.netdev.driver);
 #if LWIP_IPV4
     ip4_addr_t local4, mask4, gw4;
-    local4.addr = htonl(_TEST_ADDR4_LOCAL);
-    mask4.addr = htonl(_TEST_ADDR4_MASK);
-    gw4.addr = htonl(_TEST_ADDR4_GW);
+    local4.addr = _TEST_ADDR4_LOCAL;
+    mask4.addr = _TEST_ADDR4_MASK;
+    gw4.addr = _TEST_ADDR4_GW;
     netif_add(&netif, &local4, &mask4, &gw4, &netdev, lwip_netdev_init, tcpip_input);
 #else
     netif_add(&netif, &netdev, lwip_netdev_init, tcpip_input);
@@ -222,7 +222,7 @@ void _prepare_send_checks(void)
 
     netdev_test_set_send_cb(&netdev, _netdev_send);
 #if LWIP_ARP
-    const ip4_addr_t remote4 = { .addr = htonl(_TEST_ADDR4_REMOTE) };
+    const ip4_addr_t remote4 = { .addr = _TEST_ADDR4_REMOTE };
     assert(ERR_OK == etharp_add_static_entry(&remote4, (struct eth_addr *)mac));
 #endif
 #if LWIP_IPV6
@@ -263,8 +263,8 @@ bool _inject_4packet(uint32_t src, uint32_t dst, uint8_t proto, void *data,
     IPH_LEN_SET(ip_hdr, htons(sizeof(struct ip_hdr) + data_len));
     IPH_TTL_SET(ip_hdr, 64);
     IPH_PROTO_SET(ip_hdr, proto);
-    ip_hdr->src.addr = htonl(src);
-    ip_hdr->dest.addr = htonl(dst);
+    ip_hdr->src.addr = src;
+    ip_hdr->dest.addr = dst;
     IPH_CHKSUM_SET(ip_hdr, 0);
     IPH_CHKSUM_SET(ip_hdr, inet_chksum(ip_hdr, sizeof(struct ip_hdr)));
 
diff --git a/tests/lwip_sock_tcp/constants.h b/tests/lwip_sock_tcp/constants.h
index 1b99b16950fe0f04db4f34ac5b67c3907994cd1c..168bc0e3987fe43d499e772d9e07cb50e0c1fe4c 100644
--- a/tests/lwip_sock_tcp/constants.h
+++ b/tests/lwip_sock_tcp/constants.h
@@ -29,10 +29,19 @@ extern "C" {
 #define _TEST_PORT_REMOTE   (0xa615)
 #define _TEST_NETIF         (1)
 #define _TEST_TIMEOUT       (1000000U)
-#define _TEST_ADDR4_LOCAL   (0xc0a84f96U)   /* 192.168.79.150 */
-#define _TEST_ADDR4_REMOTE  (0x7f000001U)   /* 127.0.0.1 */
-#define _TEST_ADDR4_WRONG   (0x254c6b4cU)
-#define _TEST_ADDR4_MASK    (0xffffff00U)   /* 255.255.255.0 */
+#if __BYTE_ORDER__ == __ORDER_LITTLE_ENDIAN__
+# define _TEST_ADDR4_LOCAL  (0x964fa8c0U)   /* 192.168.79.150 */
+# define _TEST_ADDR4_REMOTE (0x0100007fU)   /* 127.0.0.1 */
+# define _TEST_ADDR4_WRONG  (0x4c6b4c25U)
+# define _TEST_ADDR4_MASK   (0x00ffffffU)   /* 255.255.255.0 */
+#elif __BYTE_ORDER__ == __ORDER_BIG_ENDIAN__
+# define _TEST_ADDR4_LOCAL  (0xc0a84f96U)   /* 192.168.79.150 */
+# define _TEST_ADDR4_REMOTE (0x7f000001U)   /* 127.0.0.1 */
+# define _TEST_ADDR4_WRONG  (0x254c6b4cU)
+# define _TEST_ADDR4_MASK   (0xffffff00U)   /* 255.255.255.0 */
+#else
+# error "Byte order is neither little nor big!"
+#endif
 #define _TEST_ADDR4_GW      (0UL)           /* so we can test unreachability */
 #define _TEST_ADDR6_LOCAL   { 0x2f, 0xc4, 0x11, 0x5a, 0xe6, 0x91, 0x8d, 0x5d, \
                               0x8c, 0xd1, 0x47, 0x07, 0xb7, 0x6f, 0x9b, 0x48 }
diff --git a/tests/lwip_sock_tcp/main.c b/tests/lwip_sock_tcp/main.c
index 5903fe6a407f2099640828ca807b83b191d8b68a..5b98ce214283daf101ead2ec4c50b01ed42b3388 100644
--- a/tests/lwip_sock_tcp/main.c
+++ b/tests/lwip_sock_tcp/main.c
@@ -88,7 +88,7 @@ static void tear_down(void)
 #ifdef SO_REUSE
 static void test_tcp_connect4__EADDRINUSE(void)
 {
-    const sock_tcp_ep_t remote = { .addr = { .ipv4_u32 = htonl(_TEST_ADDR4_REMOTE) },
+    static const sock_tcp_ep_t remote = { .addr = { .ipv4_u32 = _TEST_ADDR4_REMOTE },
                                           .family = AF_INET,
                                           .port = _TEST_PORT_REMOTE,
                                           .netif = SOCK_ADDR_ANY_NETIF };
@@ -107,7 +107,7 @@ static void test_tcp_connect4__EADDRINUSE(void)
 
 static void test_tcp_connect4__EAFNOSUPPORT(void)
 {
-    const sock_tcp_ep_t remote = { .addr = { .ipv4_u32 = htonl(_TEST_ADDR4_REMOTE) },
+    static const sock_tcp_ep_t remote = { .addr = { .ipv4_u32 = _TEST_ADDR4_REMOTE },
                                           .port = _TEST_PORT_REMOTE,
                                           .netif = SOCK_ADDR_ANY_NETIF };
 
@@ -129,7 +129,7 @@ static void test_tcp_connect4__EINVAL_addr(void)
 
 static void test_tcp_connect4__EINVAL_netif(void)
 {
-    const sock_tcp_ep_t remote = { .addr = { .ipv4_u32 = htonl(_TEST_ADDR4_REMOTE) },
+    static const sock_tcp_ep_t remote = { .addr = { .ipv4_u32 = _TEST_ADDR4_REMOTE },
                                           .family = AF_INET,
                                           .port = _TEST_PORT_REMOTE,
                                           .netif = (_TEST_NETIF + 1) };
@@ -142,7 +142,7 @@ static void test_tcp_connect4__EINVAL_netif(void)
 
 static void test_tcp_connect4__success_without_port(void)
 {
-    const sock_tcp_ep_t remote = { .addr = { .ipv4_u32 = htonl(_TEST_ADDR4_REMOTE) },
+    static const sock_tcp_ep_t remote = { .addr = { .ipv4_u32 = _TEST_ADDR4_REMOTE },
                                           .family = AF_INET,
                                           .port = _TEST_PORT_REMOTE,
                                           .netif = _TEST_NETIF };
@@ -158,13 +158,13 @@ static void test_tcp_connect4__success_without_port(void)
     assert(0 == sock_tcp_connect(&_sock, &remote, 0, SOCK_FLAGS_REUSE_EP));
     assert(0 == sock_tcp_get_remote(&_sock, &ep));
     assert(AF_INET == ep.family);
-    assert(htonl(_TEST_ADDR4_REMOTE) == ep.addr.ipv4_u32);
+    assert(_TEST_ADDR4_REMOTE == ep.addr.ipv4_u32);
     assert(SOCK_ADDR_ANY_NETIF == ep.netif);
     assert(_TEST_PORT_REMOTE == ep.port);
 }
 static void test_tcp_connect4__success_local_port(void)
 {
-    const sock_tcp_ep_t remote = { .addr = { .ipv4_u32 = htonl(_TEST_ADDR4_REMOTE) },
+    static const sock_tcp_ep_t remote = { .addr = { .ipv4_u32 = _TEST_ADDR4_REMOTE },
                                           .family = AF_INET,
                                           .port = _TEST_PORT_REMOTE,
                                           .netif = SOCK_ADDR_ANY_NETIF };
@@ -184,7 +184,7 @@ static void test_tcp_connect4__success_local_port(void)
     assert(_TEST_PORT_LOCAL == ep.port);
     assert(0 == sock_tcp_get_remote(&_sock, &ep));
     assert(AF_INET == ep.family);
-    assert(htonl(_TEST_ADDR4_REMOTE) == ep.addr.ipv4_u32);
+    assert(_TEST_ADDR4_REMOTE == ep.addr.ipv4_u32);
     assert(SOCK_ADDR_ANY_NETIF == ep.netif);
     assert(_TEST_PORT_REMOTE == ep.port);
 }
@@ -192,7 +192,7 @@ static void test_tcp_connect4__success_local_port(void)
 #ifdef SO_REUSE
 static void test_tcp_listen4__EADDRINUSE(void)
 {
-    const sock_tcp_ep_t local = { .addr = { .ipv4_u32 = htonl(_TEST_ADDR4_LOCAL) },
+    static const sock_tcp_ep_t local = { .addr = { .ipv4_u32 = _TEST_ADDR4_LOCAL },
                                          .family = AF_INET,
                                          .port = _TEST_PORT_LOCAL,
                                          .netif = SOCK_ADDR_ANY_NETIF };
@@ -211,7 +211,7 @@ static void test_tcp_listen4__EADDRINUSE(void)
 
 static void test_tcp_listen4__EAFNOSUPPORT(void)
 {
-    const sock_tcp_ep_t local = { .addr = { .ipv4_u32 = htonl(_TEST_ADDR4_LOCAL) },
+    static const sock_tcp_ep_t local = { .addr = { .ipv4_u32 = _TEST_ADDR4_LOCAL },
                                          .port = _TEST_PORT_LOCAL,
                                          .netif = SOCK_ADDR_ANY_NETIF };
 
@@ -221,7 +221,7 @@ static void test_tcp_listen4__EAFNOSUPPORT(void)
 
 static void test_tcp_listen4__EINVAL(void)
 {
-    const sock_tcp_ep_t local = { .addr = { .ipv4_u32 = htonl(_TEST_ADDR4_LOCAL) },
+    static const sock_tcp_ep_t local = { .addr = { .ipv4_u32 = _TEST_ADDR4_LOCAL },
                                          .family = AF_INET,
                                          .port = _TEST_PORT_LOCAL,
                                          .netif = (_TEST_NETIF + 1) };
@@ -232,7 +232,7 @@ static void test_tcp_listen4__EINVAL(void)
 
 static void test_tcp_listen4__success_any_netif(void)
 {
-    const sock_tcp_ep_t local = { .addr = { .ipv4_u32 = htonl(_TEST_ADDR4_LOCAL) },
+    static const sock_tcp_ep_t local = { .addr = { .ipv4_u32 = _TEST_ADDR4_LOCAL },
                                          .family = AF_INET,
                                          .port = _TEST_PORT_LOCAL,
                                          .netif = SOCK_ADDR_ANY_NETIF };
@@ -242,7 +242,7 @@ static void test_tcp_listen4__success_any_netif(void)
                                 _QUEUE_SIZE, 0));
     assert(0 == sock_tcp_queue_get_local(&_queue, &ep));
     assert(AF_INET == ep.family);
-    assert(htonl(_TEST_ADDR4_LOCAL) == ep.addr.ipv4_u32);
+    assert(_TEST_ADDR4_LOCAL == ep.addr.ipv4_u32);
     assert(SOCK_ADDR_ANY_NETIF == ep.netif);
     assert(_TEST_PORT_LOCAL == ep.port);
 }
@@ -304,7 +304,7 @@ static void test_tcp_accept4__success(void)
     sock_tcp_ep_t ep;
     sock_tcp_t *sock;
 
-    _server_addr.addr.ipv4_u32 = htonl(_TEST_ADDR4_REMOTE);  /* loopback */
+    _server_addr.addr.ipv4_u32 = _TEST_ADDR4_REMOTE;  /* loopback */
     _server_addr.family = AF_INET;
     _server_addr.port = _TEST_PORT_LOCAL;
     _server_addr.netif = SOCK_ADDR_ANY_NETIF;
@@ -319,7 +319,7 @@ static void test_tcp_accept4__success(void)
     assert(_TEST_PORT_LOCAL == ep.port);
     assert(0 == sock_tcp_get_remote(sock, &ep));
     assert(AF_INET == ep.family);
-    assert(htonl(_TEST_ADDR4_REMOTE) == ep.addr.ipv4_u32);
+    assert(_TEST_ADDR4_REMOTE == ep.addr.ipv4_u32);
     assert(SOCK_ADDR_ANY_NETIF == ep.netif);
     assert(_TEST_PORT_REMOTE == ep.port);
 }
@@ -328,7 +328,7 @@ static void test_tcp_accept4__success(void)
 
 static void test_tcp_read4__EAGAIN(void)
 {
-    const sock_tcp_ep_t remote = { .addr = { .ipv4_u32 = htonl(_TEST_ADDR4_REMOTE) },
+    static const sock_tcp_ep_t remote = { .addr = { .ipv4_u32 = _TEST_ADDR4_REMOTE },
                                           .family = AF_INET,
                                           .port = _TEST_PORT_REMOTE,
                                           .netif = SOCK_ADDR_ANY_NETIF };
@@ -348,7 +348,7 @@ static void test_tcp_read4__EAGAIN(void)
 
 static void test_tcp_read4__ECONNRESET(void)
 {
-    const sock_tcp_ep_t remote = { .addr = { .ipv4_u32 = htonl(_TEST_ADDR4_REMOTE) },
+    static const sock_tcp_ep_t remote = { .addr = { .ipv4_u32 = _TEST_ADDR4_REMOTE },
                                           .family = AF_INET,
                                           .port = _TEST_PORT_REMOTE,
                                           .netif = SOCK_ADDR_ANY_NETIF };
@@ -378,7 +378,7 @@ static void test_tcp_read4__ENOTCONN(void)
 
 static void test_tcp_read4__ETIMEDOUT(void)
 {
-    const sock_tcp_ep_t remote = { .addr = { .ipv4_u32 = htonl(_TEST_ADDR4_REMOTE) },
+    static const sock_tcp_ep_t remote = { .addr = { .ipv4_u32 = _TEST_ADDR4_REMOTE },
                                           .family = AF_INET,
                                           .port = _TEST_PORT_REMOTE,
                                           .netif = SOCK_ADDR_ANY_NETIF };
@@ -401,7 +401,7 @@ static void test_tcp_read4__ETIMEDOUT(void)
 
 static void test_tcp_read4__success(void)
 {
-    const sock_tcp_ep_t remote = { .addr = { .ipv4_u32 = htonl(_TEST_ADDR4_REMOTE) },
+    static const sock_tcp_ep_t remote = { .addr = { .ipv4_u32 = _TEST_ADDR4_REMOTE },
                                           .family = AF_INET,
                                           .port = _TEST_PORT_REMOTE,
                                           .netif = SOCK_ADDR_ANY_NETIF };
@@ -429,7 +429,7 @@ static void test_tcp_read4__success(void)
 
 static void test_tcp_read4__success_with_timeout(void)
 {
-    const sock_tcp_ep_t remote = { .addr = { .ipv4_u32 = htonl(_TEST_ADDR4_REMOTE) },
+    static const sock_tcp_ep_t remote = { .addr = { .ipv4_u32 = _TEST_ADDR4_REMOTE },
                                           .family = AF_INET,
                                           .port = _TEST_PORT_REMOTE,
                                           .netif = SOCK_ADDR_ANY_NETIF };
@@ -457,7 +457,7 @@ static void test_tcp_read4__success_with_timeout(void)
 
 static void test_tcp_read4__success_non_blocking(void)
 {
-    const sock_tcp_ep_t remote = { .addr = { .ipv4_u32 = htonl(_TEST_ADDR4_REMOTE) },
+    static const sock_tcp_ep_t remote = { .addr = { .ipv4_u32 = _TEST_ADDR4_REMOTE },
                                           .family = AF_INET,
                                           .port = _TEST_PORT_REMOTE,
                                           .netif = SOCK_ADDR_ANY_NETIF };
@@ -492,7 +492,7 @@ static void test_tcp_write4__ENOTCONN(void)
 
 static void test_tcp_write4__success(void)
 {
-    const sock_tcp_ep_t remote = { .addr = { .ipv4_u32 = htonl(_TEST_ADDR4_REMOTE) },
+    static const sock_tcp_ep_t remote = { .addr = { .ipv4_u32 = _TEST_ADDR4_REMOTE },
                                           .family = AF_INET,
                                           .port = _TEST_PORT_REMOTE,
                                           .netif = SOCK_ADDR_ANY_NETIF };
diff --git a/tests/lwip_sock_udp/constants.h b/tests/lwip_sock_udp/constants.h
index 4a15841a44e452414df5e8ccbe7471295595a0c7..a2e9540e940758f1053e0938298cb6ed4af76970 100644
--- a/tests/lwip_sock_udp/constants.h
+++ b/tests/lwip_sock_udp/constants.h
@@ -29,10 +29,19 @@ extern "C" {
 #define _TEST_PORT_REMOTE   (0xa615)
 #define _TEST_NETIF         (1)
 #define _TEST_TIMEOUT       (1000000U)
-#define _TEST_ADDR4_LOCAL   (0xc0a84f96U)   /* 192.168.79.150 */
-#define _TEST_ADDR4_REMOTE  (0xc0a84f6bU)   /* 192.168.79.107 */
-#define _TEST_ADDR4_WRONG   (0x254c6b4cU)
-#define _TEST_ADDR4_MASK    (0xffffff00U)   /* 255.255.255.0 */
+#if __BYTE_ORDER__ == __ORDER_LITTLE_ENDIAN__
+# define _TEST_ADDR4_LOCAL  (0x964fa8c0U)   /* 192.168.79.150 */
+# define _TEST_ADDR4_REMOTE (0x6b4fa8c0U)   /* 192.168.79.107 */
+# define _TEST_ADDR4_WRONG  (0x4c6b4c25U)
+# define _TEST_ADDR4_MASK   (0x00ffffffU)   /* 255.255.255.0 */
+#elif __BYTE_ORDER__ == __ORDER_BIG_ENDIAN__
+# define _TEST_ADDR4_LOCAL  (0xc0a84f96U)   /* 192.168.79.150 */
+# define _TEST_ADDR4_REMOTE (0xc0a84f6bU)   /* 192.168.79.107 */
+# define _TEST_ADDR4_WRONG  (0x254c6b4cU)
+# define _TEST_ADDR4_MASK   (0xffffff00U)   /* 255.255.255.0 */
+#else
+# error "Byte order is neither little nor big!"
+#endif
 #define _TEST_ADDR4_GW      (0UL)           /* so we can test unreachability */
 #define _TEST_ADDR6_LOCAL   { 0x2f, 0xc4, 0x11, 0x5a, 0xe6, 0x91, 0x8d, 0x5d, \
                               0x8c, 0xd1, 0x47, 0x07, 0xb7, 0x6f, 0x9b, 0x48 }
diff --git a/tests/lwip_sock_udp/main.c b/tests/lwip_sock_udp/main.c
index 202b23627bb789e09e0d1be9364a6638c79d06bb..3db379c3f7d606e6ad46bd9461f55e8b4c5f8688 100644
--- a/tests/lwip_sock_udp/main.c
+++ b/tests/lwip_sock_udp/main.c
@@ -85,10 +85,10 @@ static void test_sock_udp_create4__EINVAL_netif(void)
     static const sock_udp_ep_t local = { .family = AF_INET, .netif = _TEST_NETIF,
                                          .port = _TEST_PORT_LOCAL };
     /* port may not be NULL according to doc */
-    const sock_udp_ep_t remote = { .family = AF_INET,
-                                   .netif = (_TEST_NETIF + 1),
-                                   .port = _TEST_PORT_REMOTE,
-                                   .addr = { .ipv4_u32 = htonl(_TEST_ADDR4_REMOTE) } };
+    static const sock_udp_ep_t remote = { .family = AF_INET,
+                                          .netif = (_TEST_NETIF + 1),
+                                          .port = _TEST_PORT_REMOTE,
+                                          .addr = { .ipv4_u32 = _TEST_ADDR4_REMOTE } };
 
     assert(-EINVAL == sock_udp_create(&_sock, &local, &remote, SOCK_FLAGS_REUSE_EP));
 }
@@ -157,9 +157,9 @@ static void test_sock_udp_create4__only_local_reuse_ep(void)
 
 static void test_sock_udp_create4__only_remote(void)
 {
-    const sock_udp_ep_t remote = { .family = AF_INET,
-                                   .port = _TEST_PORT_REMOTE,
-                                   .addr =  { .ipv4_u32 = htonl(_TEST_ADDR4_REMOTE) } };
+    static const sock_udp_ep_t remote = { .family = AF_INET,
+                                          .port = _TEST_PORT_REMOTE,
+                                          .addr =  { .ipv4_u32 = _TEST_ADDR4_REMOTE } };
     sock_udp_ep_t ep;
 
     assert(0 == sock_udp_create(&_sock, NULL, &remote, SOCK_FLAGS_REUSE_EP));
@@ -167,7 +167,7 @@ static void test_sock_udp_create4__only_remote(void)
     assert(0 == sock_udp_get_local(&_sock, &ep));
     assert(0 == sock_udp_get_remote(&_sock, &ep));
     assert(AF_INET == ep.family);
-    assert(htonl(_TEST_ADDR4_REMOTE) == ep.addr.ipv4_u32);
+    assert(_TEST_ADDR4_REMOTE == ep.addr.ipv4_u32);
     assert(SOCK_ADDR_ANY_NETIF == ep.netif);
     assert(_TEST_PORT_REMOTE == ep.port);
 }
@@ -176,9 +176,9 @@ static void test_sock_udp_create4__full(void)
 {
     static const sock_udp_ep_t local = { .family = AF_INET, .netif = _TEST_NETIF,
                                          .port = _TEST_PORT_LOCAL };
-    const sock_udp_ep_t remote = { .family = AF_INET,
-                                   .port = _TEST_PORT_REMOTE,
-                                   .addr =  { .ipv4_u32 = htonl(_TEST_ADDR4_REMOTE) } };
+    static const sock_udp_ep_t remote = { .family = AF_INET,
+                                          .port = _TEST_PORT_REMOTE,
+                                          .addr =  { .ipv4_u32 = _TEST_ADDR4_REMOTE } };
     sock_udp_ep_t ep;
 
     assert(0 == sock_udp_create(&_sock, &local, &remote, SOCK_FLAGS_REUSE_EP));
@@ -190,7 +190,7 @@ static void test_sock_udp_create4__full(void)
     assert(_TEST_PORT_LOCAL == ep.port);
     assert(0 == sock_udp_get_remote(&_sock, &ep));
     assert(AF_INET == ep.family);
-    assert(htonl(_TEST_ADDR4_REMOTE) == ep.addr.ipv4_u32);
+    assert(_TEST_ADDR4_REMOTE == ep.addr.ipv4_u32);
     assert(SOCK_ADDR_ANY_NETIF == ep.netif);
     assert(_TEST_PORT_REMOTE == ep.port);
 }
@@ -246,9 +246,9 @@ static void test_sock_udp_recv4__socketed(void)
 {
     static const sock_udp_ep_t local = { .family = AF_INET,
                                          .port = _TEST_PORT_LOCAL };
-    const sock_udp_ep_t remote = { .addr = { .ipv4_u32 = htonl(_TEST_ADDR4_REMOTE) },
-                                   .family = AF_INET,
-                                   .port = _TEST_PORT_REMOTE };
+    static const sock_udp_ep_t remote = { .addr = { .ipv4_u32 = _TEST_ADDR4_REMOTE },
+                                          .family = AF_INET,
+                                          .port = _TEST_PORT_REMOTE };
 
     assert(0 == sock_udp_create(&_sock, &local, &remote, SOCK_FLAGS_REUSE_EP));
     assert(_inject_4packet(_TEST_ADDR4_REMOTE, _TEST_ADDR4_LOCAL, _TEST_PORT_REMOTE,
@@ -264,9 +264,9 @@ static void test_sock_udp_recv4__socketed_with_remote(void)
 {
     static const sock_udp_ep_t local = { .family = AF_INET,
                                          .port = _TEST_PORT_LOCAL };
-    const sock_udp_ep_t remote = { .addr = { .ipv4_u32 = htonl(_TEST_ADDR4_REMOTE) },
-                                   .family = AF_INET,
-                                   .port = _TEST_PORT_REMOTE };
+    static const sock_udp_ep_t remote = { .addr = { .ipv4_u32 = _TEST_ADDR4_REMOTE },
+                                          .family = AF_INET,
+                                          .port = _TEST_PORT_REMOTE };
     sock_udp_ep_t result;
 
     assert(0 == sock_udp_create(&_sock, &local, &remote, SOCK_FLAGS_REUSE_EP));
@@ -277,7 +277,7 @@ static void test_sock_udp_recv4__socketed_with_remote(void)
                                            sizeof(_test_buffer),
                                            SOCK_NO_TIMEOUT, &result));
     assert(AF_INET == result.family);
-    assert(htonl(_TEST_ADDR4_REMOTE) == result.addr.ipv4_u32);
+    assert(_TEST_ADDR4_REMOTE == result.addr.ipv4_u32);
     assert(_TEST_PORT_REMOTE == result.port);
 #if LWIP_NETBUF_RECVINFO
     assert(_TEST_NETIF == result.netif);
@@ -287,9 +287,9 @@ static void test_sock_udp_recv4__socketed_with_remote(void)
 
 static void test_sock_udp_recv4__unsocketed(void)
 {
-    const sock_udp_ep_t local = { .addr = { .ipv4_u32 = htonl(_TEST_ADDR4_LOCAL) },
-                                  .family = AF_INET,
-                                  .port = _TEST_PORT_LOCAL };
+    static const sock_udp_ep_t local = { .addr = { .ipv4_u32 = _TEST_ADDR4_LOCAL },
+                                         .family = AF_INET,
+                                         .port = _TEST_PORT_LOCAL };
 
     assert(0 == sock_udp_create(&_sock, &local, NULL, SOCK_FLAGS_REUSE_EP));
     assert(_inject_4packet(_TEST_ADDR4_REMOTE, _TEST_ADDR4_LOCAL, _TEST_PORT_REMOTE,
@@ -315,7 +315,7 @@ static void test_sock_udp_recv4__unsocketed_with_remote(void)
                                            sizeof(_test_buffer),
                                            SOCK_NO_TIMEOUT, &result));
     assert(AF_INET == result.family);
-    assert(htonl(_TEST_ADDR4_REMOTE) == result.addr.ipv4_u32);
+    assert(_TEST_ADDR4_REMOTE == result.addr.ipv4_u32);
     assert(_TEST_PORT_REMOTE == result.port);
 #if LWIP_NETBUF_RECVINFO
     assert(_TEST_NETIF == result.netif);
@@ -337,7 +337,7 @@ static void test_sock_udp_recv4__with_timeout(void)
                                            sizeof(_test_buffer), _TEST_TIMEOUT,
                                            &result));
     assert(AF_INET == result.family);
-    assert(htonl(_TEST_ADDR4_REMOTE) == result.addr.ipv4_u32);
+    assert(_TEST_ADDR4_REMOTE == result.addr.ipv4_u32);
     assert(_TEST_PORT_REMOTE == result.port);
 #if LWIP_NETBUF_RECVINFO
     assert(_TEST_NETIF == result.netif);
@@ -358,7 +358,7 @@ static void test_sock_udp_recv4__non_blocking(void)
     assert(sizeof("ABCD") == sock_udp_recv(&_sock, _test_buffer,
                                            sizeof(_test_buffer), 0, &result));
     assert(AF_INET == result.family);
-    assert(htonl(_TEST_ADDR4_REMOTE) == result.addr.ipv4_u32);
+    assert(_TEST_ADDR4_REMOTE == result.addr.ipv4_u32);
     assert(_TEST_PORT_REMOTE == result.port);
 #if LWIP_NETBUF_RECVINFO
     assert(_TEST_NETIF == result.netif);
@@ -368,9 +368,9 @@ static void test_sock_udp_recv4__non_blocking(void)
 
 static void test_sock_udp_send4__EAFNOSUPPORT(void)
 {
-    const sock_udp_ep_t remote = { .addr = { .ipv4_u32 = htonl(_TEST_ADDR4_REMOTE) },
-                                   .family = AF_UNSPEC,
-                                   .port = _TEST_PORT_REMOTE };
+    static const sock_udp_ep_t remote = { .addr = { .ipv4_u32 = _TEST_ADDR4_REMOTE },
+                                          .family = AF_UNSPEC,
+                                          .port = _TEST_PORT_REMOTE };
 
     assert(-EAFNOSUPPORT == sock_udp_send(NULL, "ABCD", sizeof("ABCD"),
                                           &remote));
@@ -379,10 +379,10 @@ static void test_sock_udp_send4__EAFNOSUPPORT(void)
 
 static void test_sock_udp_send4__EINVAL_addr(void)
 {
-    const sock_udp_ep_t local = { .addr = { .ipv4_u32 = htonl(_TEST_ADDR4_LOCAL) },
-                                  .family = AF_INET,
-                                  .port = _TEST_PORT_REMOTE,
-                                  .netif = _TEST_NETIF };
+    static const sock_udp_ep_t local = { .addr = { .ipv4_u32 = _TEST_ADDR4_LOCAL },
+                                         .family = AF_INET,
+                                         .port = _TEST_PORT_REMOTE,
+                                         .netif = _TEST_NETIF };
     static const sock_udp_ep_t remote = { .family = AF_INET,
                                           .port = _TEST_PORT_REMOTE,
                                           .netif = _TEST_NETIF };
@@ -394,14 +394,14 @@ static void test_sock_udp_send4__EINVAL_addr(void)
 
 static void test_sock_udp_send4__EINVAL_netif(void)
 {
-    const sock_udp_ep_t local = { .addr = { .ipv4_u32 = htonl(_TEST_ADDR4_LOCAL) },
-                                  .family = AF_INET,
-                                  .port = _TEST_PORT_REMOTE,
-                                  .netif = _TEST_NETIF };
-    const sock_udp_ep_t remote = { .addr = { .ipv4_u32 = htonl(_TEST_ADDR4_REMOTE) },
-                                   .family = AF_INET,
-                                   .port = _TEST_PORT_REMOTE,
-                                   .netif = _TEST_NETIF + 1 };
+    static const sock_udp_ep_t local = { .addr = { .ipv4_u32 = _TEST_ADDR4_LOCAL },
+                                         .family = AF_INET,
+                                         .port = _TEST_PORT_REMOTE,
+                                         .netif = _TEST_NETIF };
+    static const sock_udp_ep_t remote = { .addr = { .ipv4_u32 = _TEST_ADDR4_REMOTE },
+                                          .family = AF_INET,
+                                          .port = _TEST_PORT_REMOTE,
+                                          .netif = _TEST_NETIF + 1 };
 
     assert(0 == sock_udp_create(&_sock, &local, NULL, SOCK_FLAGS_REUSE_EP));
     assert(-EINVAL == sock_udp_send(&_sock, "ABCD", sizeof("ABCD"), &remote));
@@ -410,9 +410,9 @@ static void test_sock_udp_send4__EINVAL_netif(void)
 
 static void test_sock_udp_send4__EHOSTUNREACH(void)
 {
-    const sock_udp_ep_t remote = { .addr = { .ipv4_u32 = htonl(_TEST_ADDR4_WRONG) },
-                                   .family = AF_INET,
-                                   .port = _TEST_PORT_REMOTE };
+    static const sock_udp_ep_t remote = { .addr = { .ipv4_u32 = _TEST_ADDR4_WRONG },
+                                          .family = AF_INET,
+                                          .port = _TEST_PORT_REMOTE };
 
     assert(-EHOSTUNREACH == sock_udp_send(NULL, "ABCD", sizeof("ABCD"),
                                           &remote));
@@ -420,8 +420,8 @@ static void test_sock_udp_send4__EHOSTUNREACH(void)
 
 static void test_sock_udp_send4__EINVAL_port(void)
 {
-    const sock_udp_ep_t remote = { .addr = { .ipv4_u32 = htonl(_TEST_ADDR4_REMOTE) },
-                                   .family = AF_INET };
+    static const sock_udp_ep_t remote = { .addr = { .ipv4_u32 = _TEST_ADDR4_REMOTE },
+                                          .family = AF_INET };
 
     assert(-EINVAL == sock_udp_send(NULL, "ABCD", sizeof("ABCD"), &remote));
     assert(_check_net());
@@ -436,9 +436,9 @@ static void test_sock_udp_send4__ENOTCONN(void)
 
 static void test_sock_udp_send4__socketed_no_local_no_netif(void)
 {
-    const sock_udp_ep_t remote = { .addr = { .ipv4_u32 = htonl(_TEST_ADDR4_REMOTE) },
-                                   .family = AF_INET,
-                                   .port = _TEST_PORT_REMOTE };
+    static const sock_udp_ep_t remote = { .addr = { .ipv4_u32 = _TEST_ADDR4_REMOTE },
+                                          .family = AF_INET,
+                                          .port = _TEST_PORT_REMOTE };
 
     assert(0 == sock_udp_create(&_sock, NULL, &remote, SOCK_FLAGS_REUSE_EP));
     assert(sizeof("ABCD") == sock_udp_send(&_sock, "ABCD", sizeof("ABCD"),
@@ -451,12 +451,12 @@ static void test_sock_udp_send4__socketed_no_local_no_netif(void)
 
 static void test_sock_udp_send4__socketed_no_netif(void)
 {
-    const sock_udp_ep_t local = { .addr = { .ipv4_u32 = htonl(_TEST_ADDR4_LOCAL) },
-                                  .family = AF_INET,
-                                  .port = _TEST_PORT_LOCAL };
-    const sock_udp_ep_t remote = { .addr = { .ipv4_u32 = htonl(_TEST_ADDR4_REMOTE) },
-                                   .family = AF_INET,
-                                   .port = _TEST_PORT_REMOTE };
+    static const sock_udp_ep_t local = { .addr = { .ipv4_u32 = _TEST_ADDR4_LOCAL },
+                                         .family = AF_INET,
+                                         .port = _TEST_PORT_LOCAL };
+    static const sock_udp_ep_t remote = { .addr = { .ipv4_u32 = _TEST_ADDR4_REMOTE },
+                                          .family = AF_INET,
+                                          .port = _TEST_PORT_REMOTE };
 
     assert(0 == sock_udp_create(&_sock, &local, &remote, SOCK_FLAGS_REUSE_EP));
     assert(sizeof("ABCD") == sock_udp_send(&_sock, "ABCD", sizeof("ABCD"),
@@ -470,10 +470,10 @@ static void test_sock_udp_send4__socketed_no_netif(void)
 
 static void test_sock_udp_send4__socketed_no_local(void)
 {
-    const sock_udp_ep_t remote = { .addr = { .ipv4_u32 = htonl(_TEST_ADDR4_REMOTE) },
-                                   .family = AF_INET,
-                                   .netif = _TEST_NETIF,
-                                   .port = _TEST_PORT_REMOTE };
+    static const sock_udp_ep_t remote = { .addr = { .ipv4_u32 = _TEST_ADDR4_REMOTE },
+                                          .family = AF_INET,
+                                          .netif = _TEST_NETIF,
+                                          .port = _TEST_PORT_REMOTE };
 
     assert(0 == sock_udp_create(&_sock, NULL, &remote, SOCK_FLAGS_REUSE_EP));
     assert(sizeof("ABCD") == sock_udp_send(&_sock, "ABCD", sizeof("ABCD"),
@@ -487,13 +487,13 @@ static void test_sock_udp_send4__socketed_no_local(void)
 
 static void test_sock_udp_send4__socketed(void)
 {
-    const sock_udp_ep_t local = { .addr = { .ipv4_u32 = htonl(_TEST_ADDR4_LOCAL) },
-                                  .family = AF_INET,
-                                  .netif = _TEST_NETIF,
-                                  .port = _TEST_PORT_LOCAL };
-    const sock_udp_ep_t remote = { .addr = { .ipv4_u32 = htonl(_TEST_ADDR4_REMOTE) },
-                                   .family = AF_INET,
-                                   .port = _TEST_PORT_REMOTE };
+    static const sock_udp_ep_t local = { .addr = { .ipv4_u32 = _TEST_ADDR4_LOCAL },
+                                         .family = AF_INET,
+                                         .netif = _TEST_NETIF,
+                                         .port = _TEST_PORT_LOCAL };
+    static const sock_udp_ep_t remote = { .addr = { .ipv4_u32 = _TEST_ADDR4_REMOTE },
+                                          .family = AF_INET,
+                                          .port = _TEST_PORT_REMOTE };
 
     assert(0 == sock_udp_create(&_sock, &local, &remote, SOCK_FLAGS_REUSE_EP));
     assert(sizeof("ABCD") == sock_udp_send(&_sock, "ABCD", sizeof("ABCD"),
@@ -507,16 +507,16 @@ static void test_sock_udp_send4__socketed(void)
 
 static void test_sock_udp_send4__socketed_other_remote(void)
 {
-    const sock_udp_ep_t local = { .addr = { .ipv4_u32 = htonl(_TEST_ADDR4_LOCAL) },
-                                  .family = AF_INET,
-                                  .netif = _TEST_NETIF,
-                                  .port = _TEST_PORT_LOCAL };
-    const sock_udp_ep_t sock_remote = { .addr = { .ipv4_u32 = htonl(_TEST_ADDR4_WRONG) },
-                                        .family = AF_INET,
-                                        .port = _TEST_PORT_REMOTE + _TEST_PORT_LOCAL };
-    const sock_udp_ep_t remote = { .addr = { .ipv4_u32 = htonl(_TEST_ADDR4_REMOTE) },
-                                   .family = AF_INET,
-                                   .port = _TEST_PORT_REMOTE };
+    static const sock_udp_ep_t local = { .addr = { .ipv4_u32 = _TEST_ADDR4_LOCAL },
+                                         .family = AF_INET,
+                                         .netif = _TEST_NETIF,
+                                         .port = _TEST_PORT_LOCAL };
+    static const sock_udp_ep_t sock_remote = { .addr = { .ipv4_u32 = _TEST_ADDR4_WRONG },
+                                               .family = AF_INET,
+                                               .port = _TEST_PORT_REMOTE + _TEST_PORT_LOCAL };
+    static const sock_udp_ep_t remote = { .addr = { .ipv4_u32 = _TEST_ADDR4_REMOTE },
+                                          .family = AF_INET,
+                                          .port = _TEST_PORT_REMOTE };
 
     assert(0 == sock_udp_create(&_sock, &local, &sock_remote, SOCK_FLAGS_REUSE_EP));
     assert(sizeof("ABCD") == sock_udp_send(&_sock, "ABCD", sizeof("ABCD"),
@@ -530,9 +530,9 @@ static void test_sock_udp_send4__socketed_other_remote(void)
 
 static void test_sock_udp_send4__unsocketed_no_local_no_netif(void)
 {
-    const sock_udp_ep_t remote = { .addr = { .ipv4_u32 = htonl(_TEST_ADDR4_REMOTE) },
-                                   .family = AF_INET,
-                                   .port = _TEST_PORT_REMOTE };
+    static const sock_udp_ep_t remote = { .addr = { .ipv4_u32 = _TEST_ADDR4_REMOTE },
+                                          .family = AF_INET,
+                                          .port = _TEST_PORT_REMOTE };
 
     assert(0 == sock_udp_create(&_sock, NULL, NULL, SOCK_FLAGS_REUSE_EP));
     assert(sizeof("ABCD") == sock_udp_send(&_sock, "ABCD", sizeof("ABCD"),
@@ -546,12 +546,12 @@ static void test_sock_udp_send4__unsocketed_no_local_no_netif(void)
 
 static void test_sock_udp_send4__unsocketed_no_netif(void)
 {
-    const sock_udp_ep_t local = { .addr = { .ipv4_u32 = htonl(_TEST_ADDR4_LOCAL) },
-                                  .family = AF_INET,
-                                  .port = _TEST_PORT_LOCAL };
-    const sock_udp_ep_t remote = { .addr = { .ipv4_u32 = htonl(_TEST_ADDR4_REMOTE) },
-                                   .family = AF_INET,
-                                   .port = _TEST_PORT_REMOTE };
+    static const sock_udp_ep_t local = { .addr = { .ipv4_u32 = _TEST_ADDR4_LOCAL },
+                                         .family = AF_INET,
+                                         .port = _TEST_PORT_LOCAL };
+    static const sock_udp_ep_t remote = { .addr = { .ipv4_u32 = _TEST_ADDR4_REMOTE },
+                                          .family = AF_INET,
+                                          .port = _TEST_PORT_REMOTE };
 
     assert(0 == sock_udp_create(&_sock, &local, NULL, SOCK_FLAGS_REUSE_EP));
     assert(sizeof("ABCD") == sock_udp_send(&_sock, "ABCD", sizeof("ABCD"),
@@ -565,10 +565,10 @@ static void test_sock_udp_send4__unsocketed_no_netif(void)
 
 static void test_sock_udp_send4__unsocketed_no_local(void)
 {
-    const sock_udp_ep_t remote = { .addr = { .ipv4_u32 = htonl(_TEST_ADDR4_REMOTE) },
-                                   .family = AF_INET,
-                                   .netif = _TEST_NETIF,
-                                   .port = _TEST_PORT_REMOTE };
+    static const sock_udp_ep_t remote = { .addr = { .ipv4_u32 = _TEST_ADDR4_REMOTE },
+                                          .family = AF_INET,
+                                          .netif = _TEST_NETIF,
+                                          .port = _TEST_PORT_REMOTE };
 
     assert(0 == sock_udp_create(&_sock, NULL, NULL, SOCK_FLAGS_REUSE_EP));
     assert(sizeof("ABCD") == sock_udp_send(&_sock, "ABCD", sizeof("ABCD"),
@@ -582,13 +582,13 @@ static void test_sock_udp_send4__unsocketed_no_local(void)
 
 static void test_sock_udp_send4__unsocketed(void)
 {
-    const sock_udp_ep_t local = { .addr = { .ipv4_u32 = htonl(_TEST_ADDR4_LOCAL) },
-                                  .family = AF_INET,
-                                  .netif = _TEST_NETIF,
-                                  .port = _TEST_PORT_LOCAL };
-    const sock_udp_ep_t remote = { .addr = { .ipv4_u32 = htonl(_TEST_ADDR4_REMOTE) },
-                                   .family = AF_INET,
-                                   .port = _TEST_PORT_REMOTE };
+    static const sock_udp_ep_t local = { .addr = { .ipv4_u32 = _TEST_ADDR4_LOCAL },
+                                         .family = AF_INET,
+                                         .netif = _TEST_NETIF,
+                                         .port = _TEST_PORT_LOCAL };
+    static const sock_udp_ep_t remote = { .addr = { .ipv4_u32 = _TEST_ADDR4_REMOTE },
+                                          .family = AF_INET,
+                                          .port = _TEST_PORT_REMOTE };
 
     assert(0 == sock_udp_create(&_sock, &local, NULL, SOCK_FLAGS_REUSE_EP));
     assert(sizeof("ABCD") == sock_udp_send(&_sock, "ABCD", sizeof("ABCD"),
@@ -602,9 +602,9 @@ static void test_sock_udp_send4__unsocketed(void)
 
 static void test_sock_udp_send4__no_sock_no_netif(void)
 {
-    const sock_udp_ep_t remote = { .addr = { .ipv4_u32 = htonl(_TEST_ADDR4_REMOTE) },
-                                   .family = AF_INET,
-                                   .port = _TEST_PORT_REMOTE };
+    static const sock_udp_ep_t remote = { .addr = { .ipv4_u32 = _TEST_ADDR4_REMOTE },
+                                          .family = AF_INET,
+                                          .port = _TEST_PORT_REMOTE };
 
     assert(sizeof("ABCD") == sock_udp_send(NULL, "ABCD", sizeof("ABCD"),
                                            &remote));
@@ -617,10 +617,10 @@ static void test_sock_udp_send4__no_sock_no_netif(void)
 
 static void test_sock_udp_send4__no_sock(void)
 {
-    const sock_udp_ep_t remote = { .addr = { .ipv4_u32 = htonl(_TEST_ADDR4_REMOTE) },
-                                   .family = AF_INET,
-                                   .netif = _TEST_NETIF,
-                                   .port = _TEST_PORT_REMOTE };
+    static const sock_udp_ep_t remote = { .addr = { .ipv4_u32 = _TEST_ADDR4_REMOTE },
+                                          .family = AF_INET,
+                                          .netif = _TEST_NETIF,
+                                          .port = _TEST_PORT_REMOTE };
 
     assert(sizeof("ABCD") == sock_udp_send(NULL, "ABCD", sizeof("ABCD"),
                                            &remote));
diff --git a/tests/lwip_sock_udp/stack.c b/tests/lwip_sock_udp/stack.c
index d4a08c43af9b30f60ae93bed1ca6a815eac3b918..1440e08734be2d00d2df1ae99ea26b1c0c9bd25a 100644
--- a/tests/lwip_sock_udp/stack.c
+++ b/tests/lwip_sock_udp/stack.c
@@ -191,9 +191,9 @@ void _net_init(void)
     assert(netdev.netdev.driver);
 #if LWIP_IPV4
     ip4_addr_t local4, mask4, gw4;
-    local4.addr = htonl(_TEST_ADDR4_LOCAL);
-    mask4.addr = htonl(_TEST_ADDR4_MASK);
-    gw4.addr = htonl(_TEST_ADDR4_GW);
+    local4.addr = _TEST_ADDR4_LOCAL;
+    mask4.addr = _TEST_ADDR4_MASK;
+    gw4.addr = _TEST_ADDR4_GW;
     netif_add(&netif, &local4, &mask4, &gw4, &netdev, lwip_netdev_init, tcpip_input);
 #else
     netif_add(&netif, &netdev, lwip_netdev_init, tcpip_input);
@@ -224,7 +224,7 @@ void _prepare_send_checks(void)
 
     netdev_test_set_send_cb(&netdev, _netdev_send);
 #if LWIP_ARP
-    const ip4_addr_t remote4 = { .addr = htonl(_TEST_ADDR4_REMOTE) };
+    const ip4_addr_t remote4 = { .addr = _TEST_ADDR4_REMOTE };
     assert(ERR_OK == etharp_add_static_entry(&remote4, (struct eth_addr *)mac));
 #endif
 #if LWIP_IPV6
@@ -268,8 +268,8 @@ bool _inject_4packet(uint32_t src, uint32_t dst, uint16_t src_port,
     IPH_LEN_SET(ip_hdr, htons(sizeof(struct ip_hdr) + udp_len));
     IPH_TTL_SET(ip_hdr, 64);
     IPH_PROTO_SET(ip_hdr, PROTNUM_UDP);
-    ip_hdr->src.addr = htonl(src);
-    ip_hdr->dest.addr = htonl(dst);
+    ip_hdr->src.addr = src;
+    ip_hdr->dest.addr = dst;
     IPH_CHKSUM_SET(ip_hdr, 0);
     IPH_CHKSUM_SET(ip_hdr, inet_chksum(ip_hdr, sizeof(struct ip_hdr)));