4.2BSD/usr/man/man5/protocols.5

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.TH PROTOCOLS 5  "15 January 1983"
.SH NAME
protocols \- protocol name data base
.SH DESCRIPTION
The
.I 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:
.HP 10
official protocol name
.br
.ns
.HP 10
protocol number
.br
.ns
.HP 10
aliases
.PP
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.
.PP
Protocol names may contain any printable
character other than a field delimiter, newline,
or comment character.
.SH FILES
/etc/protocols
.SH "SEE ALSO"
getprotoent(3N)
.SH BUGS
A name server should be used instead of a static file.
A binary indexed file format should be available for fast access.