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Subnet Mask is short for subnetwork, which means small networks in a large network. For faster data transferring, networks are broken up into small networks, i.e. subnetworks. Routers achieve this by using subnet masks, a number looks like an IP address but determines the subnetwork. For some tasks you may need a subnet mask address, it is easy to find a subnet mask. Here is how to find a subnet mask in Windows, macOS, and Linux operating system.