SubnettingWhen subnetting, some addresses are unusable for hosts. To find out more about the ratio of usable to unusable addresses for various subnetting schemes, check out my notes about Subnetting Efficiency.
To see some subnetting examples check out my Subnetting Examples.
To play with a subnetting design tool, download my Network Configurator v1.0 written in C++ (using MS Visual C++ and MFC). It is approximately 0.4 MB. Use Help menu | Instructions... for more information.
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Guy T. Schafer, Cisco-Certified Network Associate