subnet mask
A number used to identify a subnetwork so that an IP address can be shared on a LAN.
An IP address has two components, the network address and the host address.
For example, consider the IP address 66.201.69.207. Assuming this is part of a Class B network, the first two numbers (66.201) represent the Class B network address, and the second two numbers (69.207) identify a particular host on this network.
NetLingo Classification: Technical Terms
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