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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:
172.200.0.0/16
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 |
| /27 |
1/8th of a Class C |
32 hosts |
| /26 |
1/4th of a Class C |
64 hosts |
| /25 |
1/2 of a Class C |
128 hosts |
| /24 |
1 Class C |
256 hosts |
| /23 |
2 Class C |
512 hosts |
| /22 |
4 Class C |
1,024 hosts |
| /21 |
8 Class C |
2,048 hosts |
/20
|
16 Class C
|
4,096 hosts
|
/19
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32 Class C
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8,192 hosts
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/18
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64 Class C
|
16,384 hosts
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/17
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128 Class C
|
32,768 hosts
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/16
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256 Class C (= 1 Class B)
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65,536 hosts
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/15
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512 Class C
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131,072 hosts
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/14
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1,024 Class C
|
262,144 hosts
|
| /13 |
2,048 Class C |
524,288 hosts |
 F.A.Q.
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