Name Value Meaning
AF_UNSPEC 0 Unspecified protocol
AF_LOCAL 1 local to host (pipes, portals)
AF_UNIX 1 synonym for AF_LOCAL to UNIX
AF_RISCOS 1 synonym for AF_LOCAL to RISC OS
AF_INET 2 inter-network (UDP, TCP, etc)
AF_IMPLINK 3 arpanet imp protocols
AF_PUP 4 pup protocols: e.g. BSP
AF_CHAOS 5 MIT CHAOS protocols
AF_NS 6 XEROX NS protocols
AF_NBS 7 ISO protocols
AF_ECMA 8 European Computer Manufacturers protocols
AF_DATAKIT 9 Datakit protocols
AF_CCITT 10 CCITT protocols, X.25 etc
AF_SNA 11 IBM SNA
AF_DECnet 12 DECnet
AF_DLI 13 Direct Data Link interface
AF_LAT 14 LAT
AF_HYLINK 15 NSC Hyperchannel
AF_APPLETALK 16 AppleTalk protocols
AF_ROUTE 17 Internal Routing Protocol
AF_LINK 18 Link layer interface
AF_COIP 20 connection-oriented IP, aka ST II
AF_CNT 21 Computer Network Technology
AF_IPX 23 Novell Internet Protocol
AF_SIP 24 Simple Internet Protocol
AF_ISDN 26 Integrated Services Digital Network
AF_E164 AF_ISDN CCITT E.164 recommendation
AF_INET6 28 IPv6
AF_NATM 29 native ATM access
AF_ATM 30 ATM
AF_NETGRAPH 32 Netgraph sockets
AF_MAX 33 number of protocols available
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