netmask
A netmask is a string
of 0s and 1s that mask, or screen out, the network part of an IP address, so that only the
host computer part of the address remains. A frequently-used netmask is 255.255.255.0, used
for a Class C subnet (one with up to 255 host computers). The ".0" in the netmask allows the
specific host computer address to be visible.
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