PortService
    20FTP-DATA
    21FTP
    23Telnet, Internet BBS
    25SMTP, Send mail
    53DNS
    79Finger
    80HTTP, World Wide Web
    110POP3, Receive mail
    113AUTH, Authentication
    119NNTP, Net News
    139NETBIOS Session Service
    161SNMP
    162SNMP-TRAP
    443HTTPS
    500ISAKMP
    517TALK
    518NTALK
    1723PPTP, Microsoft VPN
    2049NFS, Sun Network File System