diff --git a/Userland/Libraries/LibC/arpa/inet.h b/Userland/Libraries/LibC/arpa/inet.h
index 44200357d00..3ba673731f7 100644
--- a/Userland/Libraries/LibC/arpa/inet.h
+++ b/Userland/Libraries/LibC/arpa/inet.h
@@ -6,7 +6,6 @@
 
 #pragma once
 
-#include <endian.h>
 #include <inttypes.h>
 #include <netinet/in.h>
 #include <sys/cdefs.h>
@@ -27,32 +26,4 @@ static inline int inet_aton(const char* cp, struct in_addr* inp)
 
 char* inet_ntoa(struct in_addr);
 
-static inline uint16_t htons(uint16_t value)
-{
-#if __BYTE_ORDER == __LITTLE_ENDIAN
-    return __builtin_bswap16(value);
-#else
-    return value;
-#endif
-}
-
-static inline uint16_t ntohs(uint16_t value)
-{
-    return htons(value);
-}
-
-static inline uint32_t htonl(uint32_t value)
-{
-#if __BYTE_ORDER == __LITTLE_ENDIAN
-    return __builtin_bswap32(value);
-#else
-    return value;
-#endif
-}
-
-static inline uint32_t ntohl(uint32_t value)
-{
-    return htonl(value);
-}
-
 __END_DECLS
diff --git a/Userland/Libraries/LibC/netinet/in.h b/Userland/Libraries/LibC/netinet/in.h
index 6d389892ddb..7be4b579a65 100644
--- a/Userland/Libraries/LibC/netinet/in.h
+++ b/Userland/Libraries/LibC/netinet/in.h
@@ -7,9 +7,44 @@
 #pragma once
 
 #include <Kernel/API/POSIX/netinet/in.h>
+#include <endian.h>
 
 __BEGIN_DECLS
 
 in_addr_t inet_addr(char const*);
 
+static inline uint16_t htons(uint16_t value)
+{
+#if __BYTE_ORDER == __LITTLE_ENDIAN
+    return __builtin_bswap16(value);
+#else
+    return value;
+#endif
+}
+
+static inline uint16_t ntohs(uint16_t value)
+{
+    return htons(value);
+}
+
+static inline uint32_t htonl(uint32_t value)
+{
+#if __BYTE_ORDER == __LITTLE_ENDIAN
+    return __builtin_bswap32(value);
+#else
+    return value;
+#endif
+}
+
+static inline uint32_t ntohl(uint32_t value)
+{
+    return htonl(value);
+}
+
+#define IN6_IS_ADDR_LOOPBACK(addr) \
+    (addr->s6_addr[0] == 0 && addr->s6_addr[1] == 0 && addr->s6_addr[2] == 0 && addr->s6_addr[3] == 0 && addr->s6_addr[4] == 0 && addr->s6_addr[5] == 0 && addr->s6_addr[6] == 0 && addr->s6_addr[7] == 0 && addr->s6_addr[8] == 0 && addr->s6_addr[9] == 0 && addr->s6_addr[10] == 0 && addr->s6_addr[11] == 0 && addr->s6_addr[12] == 0 && addr->s6_addr[13] == 0 && addr->s6_addr[14] == 0 && addr->s6_addr[15] == 1)
+
+#define IN6_IS_ADDR_V4MAPPED(addr) \
+    (addr->s6_addr[0] == 0 && addr->s6_addr[1] == 0 && addr->s6_addr[2] == 0 && addr->s6_addr[3] == 0 && addr->s6_addr[4] == 0 && addr->s6_addr[5] == 0 && addr->s6_addr[6] == 0 && addr->s6_addr[7] == 0 && addr->s6_addr[8] == 0xff && addr->s6_addr[9] == 0xff && addr->s6_addr[10] == 0xff && addr->s6_addr[11] == 0xff)
+
 __END_DECLS