The link below provides superb, in-depth information about IP addresses and subnetting. All the basics are covered: the breakdown of IP address ranges by class, converting decimal IP addresses to binary, and so on but lesson 6 explains subnetting more clearly than I've ever seen it explained. The author also covers routing and communications and the diagrams make it all as clear as possible.
You have to register to view the article but even if you think you understand subnetting, it's worth it.
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