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. Registered port numbers are those in the range 1024–49151. Port numbers in the range 49152–65535 are private or dynamic ports, not used by any defined application.

IANA does not enforce this; it is simply a set of recommended uses. Sometimes ports may be used for different applications or protocols than their official IANA designation. This misuse may, for example, may be by a Trojan horse, or alternatively be by a commonly used program that didn't get an IANA registered port or port range.

ICANN formed a contract with the US government on March 21, 2001, and now performs the IANA's function.

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

0 to 1023

• 1/tcp: TCP Multiplexor
• 7/tcp: ECHO protocol
• 7/udp: ECHO protocol
• 9/tcp: DISCARD protocol
• 9/udp: DISCARD protocol
• 13/tcp: DAYTIME protocol
• 17/tcp: QOTD (Quote of the Day) protocol
• 19/tcp: CHARGEN (Character Generator) protocol
• 19/udp: CHARGEN protocol
• 20/tcp: FTP (File Transfer Protocol) – data port
• 21/tcp: FTP – control (command) port
• 22/tcp: SSH (Secure Shell) – used for secure logins, file transfers (scp, sftp) and port forwarding
• 23/tcp: Telnet protocol – unencrypted text communications
• 25/tcp: SMTP (Simple Mail Transfer Protocol) – used for sending E-mails
• 53/tcp: DNS (Domain Name Server)
• 53/udp: DNS
• 67/udp: BOOTP (BootStrap Protocol) server; also used by DHCP (Dynamic Host Configuration Protocol)
• 68/udp: BOOTP client; also used by DHCP
• 69/udp: TFTP (Trivial File Transfer Protocol)
• 70/tcp: Gopher protocol
• 79/tcp: Finger protocol
• 80/tcp: HTTP (HyperText Transfer Protocol) – used for transferring web pages
• 88/tcp: Kerberos – authenticating agent
• 109/tcp: POP2 (Post Office Protocol version 2) – used for retrieving E-mails
• 110/tcp: POP3 (Post Office Protocol version 3) – used for retrieving E-mails
• 113/tcp: ident – old server identification system, still used by IRC servers to identify its users
• 119/tcp: NNTP (Network News Transfer Protocol) – used for retrieving newsgroups messages
• 123/udp: NTP (Network Time Protocol) – used for time synchronization
• 139/tcp: NetBIOS
• 143/tcp: IMAP4 (Internet Message Access Protocol 4) – used for retrieving E-mails
• 161/udp: SNMP (Simple Network Management Protocol)
• 179/tcp: BGP (Border Gateway Protocol)
• 389/tcp: LDAP (Lightweight Directory Access Protocol)
• 443/tcp: HTTPS – HTTP over SSL (encrypted transmission)
• 445/udp: Microsoft-DS SMB – used for file sharing
• 514/udp: syslog protocol – used for system logging
• 540/tcp: UUCP (Unix-to-Unix CoPy protocol)
• 636/tcp: LDAP over SSL (encrypted transmission)
• 666/tcp: id Software's DOOM multiplayer game played over TCP
• 993/tcp: IMAP4 over SSL (encrypted transmission)
• 995/tcp: POP3 over SSL (encrypted transmission)

1024 to 49151

• 1080/tcp: SOCKS proxy
• 1352/tcp: IBM Lotus Notes/Domino RCP
• 1433/tcp: Microsoft SQL database system
• 1434/tcp: Microsoft SQL Monitor
• 1434/udp: Microsoft SQL Monitor
• 1984/tcp: Big Brother – network monitoring tool
• 3128/tcp: HTTP used by web caches and the default port for the Squid cache
• 3306/tcp: MySQL database system
• 3389/tcp: Microsoft Terminal Server (RDP)
• 5190/tcp: AOL and AOL Instant Messenger
• 5222/tcp: XMPP/Jabber – client connection
• 5269/tcp: XMPP/Jabber – server connection
• 5432/tcp: PostgreSQL database system
• 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) – used when running a second web server on the same machine (the other is in port 80), for web proxy and caching server, or for running a web server as a non-root user. Default port for Jakarta Tomcat.
• 8118/tcp: Privoxy web proxy – advertisements-filtering web proxy

49152 to 65535

Unregistered Ports

These are ports that may be in common use, but that are not formally registered with IANA. Where the use conflicts with a registered use, the notation CONFLICT is used.

• 1337/tcp: WASTE Encrypted File Sharing Program
• 1521/tcp: Oracle database default listener – CONFLICT with registered use: nCube License Manager
• 2082/tcp: CPanel's default port – CONFLICT with registered use: Infowave Mobility Server
• 2086/tcp: Web Host Manager's default port – CONFLICT with registered use: GNUnet
• 5000/tcp: Universal plug-and-play (UPnP) – Windows network device interoperability; CONFLICT with registered use: commplex-main
• 5223/tcp: XMPP/Jabber – default port for SSL Client Connection
• 5800/tcp: VNC remote desktop protocol – for use over HTTP
• 5900/tcp: VNC remote desktop protocol – regular port
• 6881/tcp: BitTorrent – port often used
• 6969/tcp: BitTorrent tracker port – CONFLICT with registered use: acmsoda
• 27960/udp: (through 27969) id Software's Quake 3 and Quake 3 derived games
• 31337/tcp: Back Orifice – remote administration tool (often Trojan horse) ("31337" is the "Leet speak" version of "Elite")

External links

• Official IANA list (also linked above)
• List of selected/nonstandard TCP/IP ports and related information
• TCP/IP advanced: Ports
• ports.tantalo.net
• Kurt Seifried's ports list
• iss.net Port Knowledgebase
• GameConfig TCP and UDP port settings for games