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  4. CIDR (classless interdomain routing)

Glossary

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CIDR (classless interdomain routing)

A way of specifying a range of addresses using an arbitrary number of bits. For instance, a CIDR specification of 206.13.1.48/25 would include any address in which the first 25 bits of the address matched the first 25 bits of 206.13.1.48.