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32.\" @(#)networks.5 6.5 (Berkeley) 5/10/91
33.\"
34.Dd May 10, 1991
35.Dt NETWORKS 5
36.Os BSD 4.2
37.Sh NAME
38.Nm networks
39.Nd network name data base
40.Sh DESCRIPTION
41The
42.Xr networks
43file contains information regarding
44the known networks which comprise the
45.Tn DARPA
46Internet.
47For each network a single line should be present with the following information:
48.Bd -unfilled -offset indent
49official network name
50network number
51aliases
52.Ed
53.Pp
54Items are separated by any number of blanks and/or tab characters.
55A ``#'' indicates the beginning of a comment; characters up to the end of
56the line are not interpreted by routines which search the file.
57This file is normally created from the official network data base
58maintained at the Network Information Control Center
59.Pq Tn NIC ,
60though local
61changes may be required to bring it up to date regarding unofficial aliases
62and/or unknown networks.
63.Pp
64Network number may be specified in the conventional
65``.'' (dot) notation using the
66.Xr inet_network 3
67routine
68from the Internet address manipulation library,
69.Xr inet 3 .
70Network names may contain any printable character other than a field
71delimiter, newline, or comment character.
72.Sh FILES
73.Bl -tag -width /etc/networks -compact
74.It Pa /etc/networks
75The
76.Nm networks
77file resides in
78.Pa /etc .
79.El
80.Sh SEE ALSO
81.Xr getnetent 3
82.Sh BUGS
83A name server should be used instead of a static file.
84.Sh HISTORY
85The
86.Nm
87file format appeared in
88.Bx 4.2 .