List of well known ports (computing)

IANA is responsible for assigning port numbers to specific uses. The Well Known Ports are those in the range 0-1023. On Unix-derived operating systems, opening a port in this range to receive incoming connections requires root privileges.

See the IANA list of port assignments for a full list.

List of network protocols, by port (not exhaustive, please extend and tidy)

• 21/tcp FTP The file transfer protocol
• 22/tcp SSH Secure logins, file transfers(scp) and port forwarding
• 23/tcp Telnet non secure text communications
• 25/tcp SMTP Simple Mail Transfer Protocol (E-mail)
• 79/tcp finger Finger
• 80/tcp HTTP HyperText Transfer Protocol (WWW)
• 88/tcp Kerberos Authenticating agent
• 110/tcp POP3 Post Office Protocol (E-mail)
• 113/tcp ident old identification server system
• 119/tcp NNTP used for usenet newsgroups
• 220/tcp IMAP3
• 443/tcp HTTPS used for securely transferring web pages

(entries above 1024 should probably go on a seperate page)

• 3306/tcp MySQL Database system
• 6000/tcp X11 used for X-windows
• 6667/tcp IRC, Internet Relay Chat