What Is CIDR?
CIDR is short for Classless Inter-Domain Routing.
CIDR is an IP addressing scheme that replaces the older system based on classes A, B, and C. With CIDR, a single IP address can be used to designate many unique IP addresses. A CIDR IP address looks like a normal IP address except that it ends with a slash followed by a number, called the IP network prefix. For example:
The IP network prefix specifies how many addresses are covered by the CIDR address, with lower numbers covering more addresses. An IP network prefix of /12, for example, can be used to address 1,048,576 former Class C addresses.
CIDR addresses reduce the size of routing tables and make more IP addresses available within organizations.
CIDR is also called supernetting.
|CIDR Block Prefix
||# Equivalent Class C
||# of Host |
||1/8th of a Class C
||1/4th of a Class C
||1/2 of a Class C
||1 Class C
||2 Class C
||4 Class C
||8 Class C
||16 Class C
||32 Class C
||64 Class C
||128 Class C
||256 Class C (= 1 Class B)
||512 Class C
||1,024 Class C
||2,048 Class C
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