netmasks(4)            UNIX System V(Internet Utilities)            netmasks(4)


NAME
      netmasks - network mask data base

DESCRIPTION
      The netmasks file contains network masks used to implement IP standard
      subnetting.  For each network that is subnetted, a single line should
      exist in this file with the network number, any number of SPACE or TAB
      characters, and the network mask to use on that network.  Network numbers
      and masks may be specified in the conventional IP `.'  notation (like IP
      host addresses, but with zeroes for the host part). For example,

            128.32.0.0 255.255.255.0

      can be used to specify that the Class B network 128.32.0.0 should have
      eight bits of subnet field and eight bits of host field, in addition to
      the standard sixteen bits in the network field.

FILES
      /etc/netmasks

SEE ALSO
      ifconfig(1M)

      Postel, Jon, and Mogul, Jeff, Internet Standard Subnetting Procedure, RFC
      950, Network Information Center, SRI International, Menlo Park, Calif.,
      August 1985




























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