红色为常用协议，括号内为端口号。
bgp Border Gateway Protocol (179)chargen Character generator (19)cmd Remote commands (rcmd, 514)daytime Daytime (13)discard Discard (9)domain Domain Name Service (53)drip Dynamic Routing Information Protocol (3949)echo Echo (7)exec Exec (rsh, 512)finger Finger (79)ftp File Transfer Protocol (21)ftp-data FTP data connections (20)gopher Gopher (70)hostname NIC hostname server (101)ident Ident Protocol (113)irc Internet Relay Chat (194)klogin Kerberos login (543)kshell Kerberos shell (544)login Login (rlogin, 513)lpd Printer service (515)nntp Network News Transport Protocol (119)pim-auto-rp PIM Auto-RP (496)pop2 Post Office Protocol v2 (109)pop3 Post Office Protocol v3 (110)smtp Simple Mail Transport Protocol (25)sunrpc Sun Remote Procedure Call (111)syslog Syslog (514)tacacs TAC Access Control System (49)talk Talk (517)telnet Telnet (23)time Time (37)uucp Unix-to-Unix Copy Program (540)whois Nicname (43)www World Wide Web (HTTP, 80)