CIDR

• The Classless Inter-Domain Routing (CIDR) notation method is another way of specifying the number of masked bits in an IP address/subnet mask combination.

• Standard notation for showing a subnet mask is, for example, 255.255.255.240, but with CIDR, you need only list the number of masked digits.

• For example, 28 masked bits and four unmasked bits exist in the mask 255.255.255.240 (11111111.11111111.11111111.11110000).

• The CIDR notation for the address 192.168.4.30 with the above mask would be 192.168.4.30/28.

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