60.17 IP Addresses CIDR Notation

The classless inter-domain routing notation (CIDR) allows IP address ranges to be specified. For example, the address 123.145.167.189/32 refers to that exact IP address whereas 123.145.167.189/31 refers to the IP addresses 123.145.167.189 and 123.145.167.190. The number of addresses is calculated as \(2^{32-n}\) where \(n\) in the above two examples is 32 and 31 respectively. That is, 1 (\(2^0\)) and 2 (\(2^1\)).

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