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. FTP The file transfer protocol - data
- 21/tcp FTP The file transfer protocol - control
- 22/tcp SSH Secure logins, file transfers (scp, sftp) and port forwarding
- 23/tcp Telnet non secure text communications
- 25/tcp SMTP Simple Mail Transfer Protocol (E-mail)
- 53/tcp DNS Domain Name Server
- 53/udp DNS
- 69/udp TFTP Trivial File Transfer Protocol
- 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
- 143/tcp IMAP4 Internet Message Access Protocol (E-mail)
- 443/tcp HTTPS used for securely transferring web pages
- 445/tcp Microsoft-DS (Active Directory, Windows shares, Sasser-worm)
- 445/udp Microsoft-DS
- 591/tcp FileMaker 6.0 Web Sharing (HTTP Alternate, see port 80)
1024 to 49151
- 1027/tcp ICQ Instant Messenger Client
- 1080/tcp SOCKS Proxy
- 1337/tcp WASTE Encrypted File Sharing Program
- 3128/tcp HTTP used by web caches and the default port for the Squid cache
- 3306/tcp MySQL Database system
- 5000/tcp Universal Plug & Play Network devices interoperability
- 5190/tcp AOL and AOL Instant Messenger
- 5432/tcp Postgres Database system
- 5800/tcp VNC remote desktop protocol (for use over HTTP)
- 5900/tcp VNC remote desktop protocol (regular port)
- 6000/tcp X11 used for X-windows
- 6667/tcp IRC, Internet Relay Chat
- 8000/tcp iRDMI. Often mistakenly used instead of port 8080.
- 8080/tcp HTTP Alternate (http-alt) or WWW caching service (web cache). Often used when running a second web server on the same machine, for proxy and caching server, or for running a Web server as a non-root user. See also Port 80.
- 31337/tcp Back Orifice Remote administration tool (often Trojan horse)
49151 and beyond
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