Subnetting allows you to steal bits of an IP address which were traditionally used for hosts on the network. You can now carve smaller networks from your larger network space, and these smaller networks are referred to as subnetworks, or subnets for short.
If you apply the default subnet masks to the three usable address classes, you will see the portions of the address you can’t use for carving out subnets, as illustrated in the chart below:
A – 255
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