netmasks(4)                                                     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 exam-
     ple,

          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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