Networking 101: Understanding Subnets and CIDR
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In the olden days, there were Class A, B and C networks. These could only be divided up into equal parts, so VLSM, or Variable Length Subnet Masks , were introduced. The old Class C was a /24, B was a /16, and A was a /8. (Check out Understanding IP Addresses if you're not clear on what that means.) That's all you need to know about Classes. They don't exist anymore.
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