What Is a Subnet Mask In Networking?
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A subnet mask is a 32–bit number used to divide an IP address into a network, subnet and host portions. It allows a computer to know which part of the IP address is being used as the network portion, and which part is being used as the host portion. A subnet mask defines the size of the network by determining how many hosts can be in the network. The subnet mask also defines which address in the IP range belong to the same network.