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Subnet address

Subnet address: In an Internet Protocol (IP) address, an extension that allows users in a network to use a single IP network address for multiple physical subnetworks.

Note: A subnetted IP address contains three parts: the network, the subnet, and host addresses. Inside the subnetwork, gateways and hosts divide the local portion of the IP address into a subnet address and a host address. Outside of the subnetwork, routing continues as usual by dividing the destination address into a network portion and a local portion.

Source: from Federal Standard 1037C

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