Updated: 2022/Sep/29

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PROTOCOLS(5)                  File Formats Manual                 PROTOCOLS(5)

NAME
     protocols - protocol name data base

DESCRIPTION
     The protocols file contains information regarding the assigned protocol
     numbers used by IPv4 and IPv6 to identify the next level protocol.  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
     hash ("#") 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.

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

SEE ALSO
     getprotoent(3)

     IANA Allocation Guidelines For Values In the Internet Protocol and
     Related Headers, RFC 2780, March 2000.

     IANA Allocation Guidelines for the Protocol Field, RFC 5237, February
     2008.

HISTORY
     The protocols file format appeared in 4.2BSD, describing the "known
     protocols used in the DARPA Internet".

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

NetBSD 10.99                   November 27, 2022                  NetBSD 10.99