1.\" Copyright (c) 1983, 1991, 1993 2.\" The Regents of the University of California. All rights reserved. 3.\" 4.\" Redistribution and use in source and binary forms, with or without 5.\" modification, are permitted provided that the following conditions 6.\" are met: 7.\" 1. Redistributions of source code must retain the above copyright 8.\" notice, this list of conditions and the following disclaimer. 9.\" 2. Redistributions in binary form must reproduce the above copyright 10.\" notice, this list of conditions and the following disclaimer in the 11.\" documentation and/or other materials provided with the distribution. 12.\" 3. Neither the name of the University nor the names of its contributors 13.\" may be used to endorse or promote products derived from this software 14.\" without specific prior written permission. 15.\" 16.\" THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 17.\" ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 18.\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 19.\" ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 20.\" FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 21.\" DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 22.\" OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 23.\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 24.\" LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 25.\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 26.\" SUCH DAMAGE. 27.\" 28.\" @(#)protocols.5 8.1 (Berkeley) 6/5/93 29.\" 30.Dd December 7, 2020 31.Dt PROTOCOLS 5 32.Os 33.Sh NAME 34.Nm protocols 35.Nd protocol name data base 36.Sh DESCRIPTION 37The 38.Nm 39file contains information regarding the assigned protocol numbers 40used by IPv4 and IPv6 to identify the next level protocol. 41For each protocol a single line should be present 42with the following information: 43.Bd -unfilled -offset indent 44official protocol name 45protocol number 46aliases 47.Ed 48.Pp 49Items are separated by any number of blanks and/or 50tab characters. 51A ``#'' indicates the beginning of 52a comment; characters up to the end of the line are 53not interpreted by routines which search the file. 54.Pp 55Protocol names may contain any printable 56character other than a field delimiter, newline, 57or comment character. 58.Sh FILES 59.Bl -tag -width /etc/protocols -compact 60.It Pa /etc/protocols 61The 62.Nm 63file resides in 64.Pa /etc . 65.El 66.Sh SEE ALSO 67.Xr getprotoent 3 68.Rs 69.%R RFC 2780 70.%D March 2000 71.%T "IANA Allocation Guidelines For Values In the \ 72Internet Protocol and Related Headers" 73.Re 74.Rs 75.%R RFC 5237 76.%D February 2008 77.%T "IANA Allocation Guidelines for the Protocol Field" 78.Re 79.Sh HISTORY 80The 81.Nm 82file format appeared in 83.Bx 4.2 , 84describing the "known protocols used in the DARPA Internet". 85.Sh BUGS 86A name server should be used instead of a static file. 87