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.\"     @(#)protocols.5	8.1 (Berkeley) 6/5/93
.\"
.Dd $Mdocdate: March 3 2019 $
.Dt PROTOCOLS 5
.Os
.Sh NAME
.Nm protocols
.Nd protocol name database
.Sh DESCRIPTION
The
.Nm
file contains information regarding the known protocols used in the
Internet.
For each protocol, a single line should be present
with the following information:
.Bd -unfilled -offset indent
official protocol name
protocol number
aliases
.Ed
.Pp
Items are separated by any number of blanks and/or tab characters.
.Pp
A hash mark
.Pq Ql #
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.
.Pp
Protocol names may contain any printable character other than a
field delimiter, newline, or comment character.
.Sh FILES
.Bl -tag -width /etc/protocols -compact
.It Pa /etc/protocols
.El
.Sh SEE ALSO
.Xr getprotoent 3
.Sh HISTORY
The
.Nm
file format appeared in
.Bx 4.2 .
.Sh BUGS
A name server should be used instead of a static file.
Lines in
.Pa /etc/protocols
are limited to
.Dv BUFSIZ
characters (currently 1024).
Longer lines will be ignored.