217
217
Xerox Network Services / Systems / Standard (Xerox, XNS)
220
[PPP] XNS IDP Control Protocol (RFC 1764, Xerox, XNS, PPP, XNS, IDP)
220
[PPP] XNS IDP Control Protocol (RFC 1764, Xerox, XNS, PPP, XNS, IDP), ftp://ftp.rfc-editor.org/in-notes/rfc1764.txt
223
223
Xerox Network Services - Internet Datagram Protocol (Xerox, Internet, XNS), "XNS-IDP"