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Computing (FOLDOC) dictionary
address mask
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networking (Or "subnet mask") A bit mask used to identify
which bits in an IP address correspond to the networkaddress and subnet portions of the address. This mask is
often referred to as the subnet mask because the network
portion of the address can be determined by the class
inherent in an IP address. The address mask has ones in
positions corresponding to the network and subnet numbers and
zeros in the host number positions.