diff --git a/Userland/Libraries/LibC/netinet/in.h b/Userland/Libraries/LibC/netinet/in.h
index 3f6513d9b5..6a3163d2e6 100644
--- a/Userland/Libraries/LibC/netinet/in.h
+++ b/Userland/Libraries/LibC/netinet/in.h
@@ -42,6 +42,9 @@ static inline uint32_t ntohl(uint32_t value)
     return htonl(value);
 }
 
+#define IN_CLASSA(addr) ((((uint32_t)(addr)) & (128 << 24)) == 0)
+#define IN_CLASSB(addr) ((((uint32_t)(addr)) & (192 << 24)) == (128 << 24))
+
 #define IN_MULTICAST(x) (((x)&0xf0000000) == 0xe0000000)
 
 // NOTE: The IPv6 Addressing Scheme that we detect are documented in RFC# 2373.
@@ -52,15 +55,36 @@ static inline uint32_t ntohl(uint32_t value)
     ((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)
 
 // RFC# 2373 - 2.5.4 IPv6 Addresses with Embedded IPv4 Addresses
+#define IN6_IS_ADDR_V4COMPAT(addr) \
+    ((addr)->s6_addr32[0] == 0 && ((addr)->s6_addr32[1]) == 0 && ((addr)->s6_addr32[2]) == 0 && ntohl((addr)->s6_addr32[3]) >= 2)
+
 #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]) == 0) && (((addr)->s6_addr[9]) == 0) && (((addr)->s6_addr[10]) == 0xFF) && (((addr)->s6_addr[11]) == 0xFF))
 
 // RFC# 2373 - 2.5.8 Local-Use IPv6 Unicast Addresses
 #define IN6_IS_ADDR_LINKLOCAL(addr) \
-    (((addr)->s6_addr[0] == 0xfe) && (((addr)->s6_addr[1] & 0xc0) == 0x80))
+    (((addr)->s6_addr[0] == 0xfe) && ((addr)->s6_addr[1] == 0x80) && ((addr)->s6_addr[2] == 0) && ((addr)->s6_addr[3] == 0) && (((addr)->s6_addr32[1]) == 0))
+
+#define IN6_IS_ADDR_SITELOCAL(addr) \
+    ((addr)->s6_addr[0] == 0xfe && (addr)->s6_addr[1] == 0xc0 && (addr)->s6_addr[2] == 0 && (addr)->s6_addr[3] == 0 && (addr)->s6_addr[4] == 0 && (addr)->s6_addr[5] == 0)
 
 // RFC# 2373 - 2.7 Multicast Addresses
 #define IN6_IS_ADDR_MULTICAST(addr) \
     ((addr)->s6_addr[0] == 0xff)
 
+#define IN6_IS_ADDR_MC_NODELOCAL(addr) \
+    (IN6_IS_ADDR_MULTICAST(addr) && (((addr)->s6_addr[1] & 0xf) == 0x1))
+
+#define IN6_IS_ADDR_MC_LINKLOCAL(addr) \
+    (IN6_IS_ADDR_MULTICAST(addr) && (((addr)->s6_addr[1] & 0xf) == 0x2))
+
+#define IN6_IS_ADDR_MC_SITELOCAL(addr) \
+    (IN6_IS_ADDR_MULTICAST(addr) && (((addr)->s6_addr[1] & 0xf) == 0x5))
+
+#define IN6_IS_ADDR_MC_ORGLOCAL(addr) \
+    (IN6_IS_ADDR_MULTICAST(addr) && (((addr)->s6_addr[1] & 0xf) == 0x8))
+
+#define IN6_IS_ADDR_MC_GLOBAL(addr) \
+    (IN6_IS_ADDR_MULTICAST(addr) && (((addr)->s6_addr[1] & 0xf) == 0xe))
+
 __END_DECLS