GNU/Linux Desktop Survival Guide
by Graham Williams
IP Addresses CIDR Notation
The classless inter-domain routing notation (CIDR) allows IP address ranges to be specified. For example, the address 18.104.22.168/32 refers to that exact IP address whereas 22.214.171.124/31 refers to the IP addresses 126.96.36.199 and 188.8.131.52. The number of addresses is calculated as where in the above two examples is 32 and 31 respectively. That is, 1 () and 2 ().