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SERVICES(5) File Formats Manual SERVICES(5)

services — service name data base

The services file contains information regarding the known services available in the DARPA Internet. For each service a single line should be present with the following information: 
official service name
port number
protocol name
aliases

Items are separated by any number of blanks and/or tab characters. The port number and protocol name are considered a single ; a ``/'' is used to separate the port and protocol (e.g. ``512/tcp''). A ``#'' indicates the beginning of a comment; subsequent characters up to the end of the line are not interpreted by the routines which search the file.

Service names may contain any printable character other than a field delimiter, newline, or comment character.

/etc/services
The services file resides in /etc.

getservent(3)

A name server should be used instead of a static file.

The services file format appeared in 4.2BSD.

BSD 4.2 June 5, 1993 SERVICES(5)