System.Socket.Family.INET
data INET
data AddrIn
data SockAddrIn
inaddrANY
inaddrBROADCAST
inaddrNONE
inaddrLOOPBACK
inaddrUNSPEC_GROUP
inaddrALLHOSTS_GROUP
inaddrALLRTS_GROUP
inaddrMAXLOCAL_GROUP