Classless Inter-Domain Routing (CIDR)

• Network numbers according to classes of addresses are no longer valid.

• IP address format changes to <IP Address, Prefix>.

• Primarily used in ISP routing tables.

  • The global Internet routing tables
  • Most hosts on a network would not understand this

• Easy examples are changing the class address.

  • Class A has a /8 prefix
  • Class B has a /16 prefix
  • Class C has a /24 prefix

• What about 198.1.192.0/20?

  • Supernetted Class C address which provides for route aggregation using a concept similar to VLSM

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