osf1 man page for netmasks

netmasks(4)						     Kernel Interfaces Manual						       netmasks(4)

NAME
       netmasks - DHCP server database

DESCRIPTION
       The  netmasks  file  is employed by joind, the DHCP server, to inform it about any networks having non-standard subnet masks.  This file is
       only needed on those platforms which don't provide a netmasks database, either as a text file or as an NIS map.	Each network whose mask is
       other  than the standard A, B, or C mask should have an entry in this file.  Each entry has two fields: the network and the mask.  The net-
       work may be written with or without zeros. See join.ipaddresses(4) for details.

       This file also supports variable subnetting.  If each subnetwork is further divided into subnetworks with a variable mask, the  subnetworks
       can also appear on the LHS.

   FORMAT
       Blank  lines and lines beginning with "#" are ignored.  Entries are separated from one another by newlines.  Entries consist of two fields:
       the network number (expressed as an IP address), and the network mask expressed as an IP address.

RELATED INFORMATION
       Commands:  joind(8), join.ipaddresses(4).  delim off

																       netmasks(4)