Port numbers

Port numbers used by TCP and UDP:

Please submit new ports that you encounter!

Port/protocol   Description
-------------   ------------
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          Quote of the Day
19/tcp          Chargen Protocol
19/udp          Chargen Protocol
20/tcp          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 insecure text communications
25/tcp          SMTP Simple Mail Transfer Protocol (E-mail)
53/tcp          DNS Domain Name System 
53/udp          DNS Domain Name System
67/udp          BOOTP BootStrap Protocol (Server) Also used by DHCP Dynamic Host Configuration Protocol
68/udp          BOOTP BootStrap Protocol (Client)  Also used by DHCP Dynamic Host Configuration Protocol
69/udp          TFTP Trivial File Transfer Protocol
70/tcp          Gopher
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
139/tcp         NetBIOS 
143/tcp         IMAP4 Internet Message Access Protocol (E-mail)
514/udp         syslog used for system logging
443/tcp         HTTPS used for securely transferring web pages
445/tcp         Microsoft-DS (Active Directory, Windows shares, Sasser-worm, Agobot)
445/udp         Microsoft-DS SMB file sharing
666/tcp         id Software's Doom game played over TCP
591/tcp         FileMaker 6.0 Web Sharing (HTTP Alternate, see port 80)
993/tcp         IMAP4 over SSL, Internet Message Access Protocol (E-mail)
995/tcp         POP3 over SSL, Post Office Protocol (E-mail)
1080/tcp        SOCKS Proxy
1337/tcp        Often used on compromised/infected computers
1352/tcp        IBM Lotus Notes/Domino RCP
1433/tcp        Microsoft-SQL-Server
1434/tcp        Microsoft-SQL-Monitor
1434/udp        Microsoft-SQL-Monitor
1494/tcp        Citrix MetaFrame ICA Client
1521/tcp        Oracle database default listener
1761/tcp        Novell Zenworks Remote Control utility
1863/tcp        MSN Messenger
2082/tcp        CPanel's default port
2086/tcp        Web Host Manager 's default port
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)
4899/tcp        RAdmin remote administration tool (often Trojan horse)
5000/tcp        Universal plug-and-play Windows network device interoperability
5190/tcp        AOL and AOL Instant Messenger
5222/tcp        XMPP/Jabber Client Connection
5223/tcp        XMPP/Jabber default port for SSL Client Connection
5269/tcp        XMPP/Jabber Server Connection
5432/tcp        PostgreSQL Database system
5517/tcp        Setiqueue  Proxy server client for SETI@Home project 
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
6346/tcp        Gnutella Filesharing (Bearshare, Limewire etc.)
6347/udp        Gnutella
6348/udp        Gnutella
6349/udp        Gnutella
6350/udp        Gnutella
6355/udp        Gnutella
6667/tcp        IRC, Internet Relay Chat
6881/tcp        BitTorrent port often used
6969/tcp        BitTorrent tracker port
8000/tcp        iRDMI . Often mistakenly used instead of port 8080.
8080/tcp        HTTP. See also Port 80. Tomcat also uses this as its default port.
8118/tcp        privoxy http filtering proxy service
9898/tcp        Dabber worm (trojan/virus)
31337/tcp       Back Orifice Remote administration tool (often Trojan horse)

Links

• IANA list of port assignments.
• Dave's port list.