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Mr. Adamson wrote this in less than three hours. He hopes it will be useful in understanding subnets.
Cisco does a nice job of explaining subnetting:
Subnetting and IP for beginners
Numbers of hosts and networks for every class and mask
About the two "forbidden" network addresses, and why they're not forbidden anymore
You are free to view, modify, propagate and republish
the Java source code for this applet.
Back to Mr. Adamson's Networking Site