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OpenSolaris 2009.06 - man page for networks (opensolaris section 4)

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networks(4)				   File Formats 			      networks(4)

NAME
       networks - network name database

SYNOPSIS
       /etc/inet/networks

       /etc/networks

DESCRIPTION
       The  networks  file is a local source of information regarding the networks which comprise
       the Internet. The networks  file can be used in conjunction with,  or  instead  of,  other
       networks  sources,  including  the  NIS maps  networks.byname and  networks.byaddr and the
       NIS+ table networks. Programs use the getnetbyname(3SOCKET) routines to access this infor-
       mation.

       The network file has a single line for each network, with the following information:

	 official-network-name network-number aliases

       Items  are separated by any number of  SPACE or TAB characters. A `#' indicates the begin-
       ning of a comment. Characters up to the end of the line are not	interpreted  by  routines
       which  search  the  file. This file is normally created from the official network database
       maintained at the Network Information Control Center (NIC), though local  changes  may  be
       required to bring it up to date regarding unofficial aliases and/or unknown networks.

       Network	numbers  may  be  specified  in  the  conventional  dot  (`.') notation using the
       inet_network routine from the Internet address  manipulation  library,  inet(7P).  Network
       names  may  contain any printable character other than a field delimiter, NEWLINE, or com-
       ment character.

SEE ALSO
       getnetbyaddr(3SOCKET), getnetbyname(3SOCKET), inet(3SOCKET), nsswitch.conf(4), inet(7P)

NOTES
       The official SVR4 name of the networks  file  is  /etc/inet/networks.  The  symbolic  link
       /etc/networks exists for BSD compatibility.

       The  network  number  in networks database is the host address shifted to the right by the
       number of 0 bits in the address mask. For example, for the address 24.132.47.86 that has a
       mask  of  fffffe00,  its  network  number  is 803351. This is obtained when the address is
       shifted right by 9 bits. The address maps to 12.66.23. The trailing 0 bits should  not  be
       specified.   The  network number here is different from that described in netmasks(4). For
       this example, the entry in netmasks would be 24.132.46.0    fffffe00.

SunOS 5.11				   17 Jan 2002				      networks(4)
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