netmask
<networking> A 32-bit bit mask which shows how an Internet address is to
be divided into network, subnet and host parts. The netmask has ones in the bit
positions in the 32-bit address which are to be used for the network and subnet
parts, and zeros for the host part. The mask should contain at least the
standard network portion (as determined by the address's class), and the subnet
field should be contiguous with the network portion.
If a `+' (plus sign) is given for the netmask value, then the network number is
looked up in the NIS netmasks.byaddr map (or in the /etc/netmasks) file if not
running the NIS service.
Unix manual page: ifconfig(8).
(1995-01-30)
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