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.Dd December 7, 2020 29.Dt PROTOCOLS 5 30.Os 31.Sh NAME 32.Nm protocols 33.Nd protocol name data base 34.Sh DESCRIPTION 35The 36.Nm 37file contains information regarding the assigned protocol numbers 38used by IPv4 and IPv6 to identify the next level protocol. 39For each protocol a single line should be present 40with the following information: 41.Bd -unfilled -offset indent 42official protocol name 43protocol number 44aliases 45.Ed 46.Pp 47Items are separated by any number of blanks and/or 48tab characters. 49A ``#'' indicates the beginning of 50a comment; characters up to the end of the line are 51not interpreted by routines which search the file. 52.Pp 53Protocol names may contain any printable 54character other than a field delimiter, newline, 55or comment character. 56.Sh FILES 57.Bl -tag -width /etc/protocols -compact 58.It Pa /etc/protocols 59The 60.Nm 61file resides in 62.Pa /etc . 63.El 64.Sh SEE ALSO 65.Xr getprotoent 3 66.Rs 67.%R RFC 2780 68.%D March 2000 69.%T "IANA Allocation Guidelines For Values In the \ 70Internet Protocol and Related Headers" 71.Re 72.Rs 73.%R RFC 5237 74.%D February 2008 75.%T "IANA Allocation Guidelines for the Protocol Field" 76.Re 77.Sh HISTORY 78The 79.Nm 80file format appeared in 81.Bx 4.2 , 82describing the "known protocols used in the DARPA Internet". 83.Sh BUGS 84A name server should be used instead of a static file. 85