A number from 0 through 1023 used to identify a network service on an IP network (the Internet). Residing in a field in the TCP or UDP header, the port number directs packets to the appropriate application in the server. The most well-known port is 80, which identifies HTTP traffic for a Web server.
Registered and Private Ports
The Internet Assigned Numbers Authority (IANA) registers ports 1024 to 49151 for the convenience of the Internet community. Port numbers from 49152 to 65535 are private ports, also called "dynamic ports." For the complete list of well-known ports and registered ports, visit www.iana.org/assignments/port-numbers. See port number, port scanning, ICANN and IANA.
Registered and Private Ports
The Internet Assigned Numbers Authority (IANA) registers ports 1024 to 49151 for the convenience of the Internet community. Port numbers from 49152 to 65535 are private ports, also called "dynamic ports." For the complete list of well-known ports and registered ports, visit www.iana.org/assignments/port-numbers. See port number, port scanning, ICANN and IANA.
COMMON WELL-KNOWN PORTS Service Port Function HTTP 80 Web HTTPS 443 Web (secure) FTP 20,21 File transfer FTPS 989,990 File transfer (secure) Telnet 23 Remote login SSH 22 Remote login (secure) DNS 53 Host naming SMTP 25 Internet mail POP3 110 Client access IMAP 143 Client access NNTP 119 Usenet newsgroups NNTPS 563 Usenet newsgroups (secure) IRC 194 Chat NTP 123 Network time SNMP 161,162 Network management CMIP 163,164 Network management Syslog 514 Event logging Kerberos 88 Authentication NetBIOS 137-139 DOS/Windows naming
 | Reproduced with permission from Computer Desktop Encyclopedia. Copyright (c) 1981-2008 The Computer Language Company Inc. All rights reserved. |
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