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TCP/IP Guide by Charles M. Kozierok

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IP Subnetting Step 4: Determining Subnet Identifiers and Subnet Addresses

The network ID assigned to the network applies to the entire network. This includes all subnets and all hosts in all subnets. Each subnet, however, needs to be identified with a unique subnet identifier, or subnet ID, so it can be differentiated from the other subnets in the network. This is the purpose of the subnet ID bits that you took from the host ID bits in subnetting. After you have identified each subnet, you need to determine the address of each subnet, so you can use this in assigning hosts specific IP addresses.

This is another step in subnetting that is not really hard to understand or do. The key to understanding how to determine subnet IDs and subnet addresses ...

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