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CCENT/CCNA ICND1 100-101 Official Cert Guide by Wendell Odom

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Finding All Subnets with More Than 8 Subnet Bits

Earlier, the section “A Formal Process with Less Than 8 Subnet Bits” assumed less than 8 subnet bits for the purpose of simplifying the discussions while you learn. In real life, you need to be able to find all subnet IDs with any valid mask, so you cannot assume less than 8 subnet bits.

The examples that have at least 9 subnet bits have a minimum of 512 subnet IDs, so writing down such a list would take a lot of time. To conserve space, the examples will use shorthand, rather than list hundreds or thousands of subnet IDs.

The process with less than 8 subnet bits told you to count in increments of the magic number in one octet. With more than 8 subnet bits, the new expanded process must tell you ...

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