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PROTOCOLS(5) FreeBSD File Formats Manual PROTOCOLS(5)

protocols
protocol name data base

The protocols file contains information regarding the known protocols used in the DARPA Internet. For each protocol a single line should be present with the following information:
official protocol name 
protocol number 
aliases
Items are separated by any number of blanks and/or tab characters. A ``#'' indicates the beginning of a comment; characters up to the end of the line are not interpreted by routines which search the file.
Protocol names may contain any printable character other than a field delimiter, newline, or comment character.

/etc/protocols
The protocols file resides in /etc.

getprotoent(3)

The protocols file format appeared in 4.2BSD.

A name server should be used instead of a static file.
June 5, 1993 FreeBSD 12.0-RELEASE

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