![How to View Subnet Mask in your OS – McAfee Activate How to View Subnet Mask in your OS – McAfee Activate](http://www.seattlemartialartsclasses.com/wp-content/uploads/2019/05/subwat-mask-310x168.png)
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.
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