port number

port number
   The default identifier for a TCP/IP (Transmission Control Protocol/ Internet Protocol) or Internet process.
   For example, ftp (File Transport Protocol), HTML (HyperText Markup Language), and Telnet are all available at preassigned unique port numbers so that the computer knows how to respond when it is contacted on a specific port; Web servers use port 80, and SMTP (Simple Mail Transfer Protocol) e-mail is always delivered to port 25. You can override these defaults by specifying different values in a URL, but whether they will work depends on the configuration on the target system.
   A total of 65,535 port numbers are available for use with TCP, and the same number are available for UDP (User Datagram Protocol).
   See also port.

Dictionary of networking . 2014.

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