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TCP/IP Guide by Charles M. Kozierok

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IP Subnetting Summary Tables for Class A, Class B, and Class C Networks

Since there are only a few options for how to subnet Class A, Class B, and Class C networks, I list the options for each class in summary Tables Table 18-3 through Table 18-5. These tables can help you quickly decide how many bits to use for subnet ID and host ID, and then what the subnet mask is for their selection. They also summarize nicely what I've discussed so far in this chapter.

Each row of each table shows one possible subnetting option for that class, including the number of bits for each of the subnet ID and host ID, and the number of subnets and hosts based on the number of bits. I then show the subnet mask in binary and decimal form, as well as in CIDR notation ...

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