➕CIDR Conversion Table

CIDR Conversion Table

Understanding:

Class A, B, and C Networks:

The above table uses Class A, B, and C to define network types. Network classes define how many addresses are allowed on the network, with class A being the largest and class C being the smallest. Specific size details are defined in the following class definitions:

Class A: Allows 224 host addresses on the network. The starting host address is 0.0.0.0 and the ending address is 127.0.0.0. These networks use the 255.0.0.0 subnet mask, or /8 CIDR notation.

Class B: Allows 216 host addresses on the network. The starting host address is 128.0.0.0 and the ending address is 191.255.0.0. These networks use the 255.255.0.0 subnet mask, or /16 CIDR notation.

Class C: Allows 28 host addresses on the network. The starting host address is 192.0.0.0 and the ending address is 223.255.255.0. These networks use the 255.255.255.0 subnet mask, or /24 CIDR notation.

CIDR Conversion Table:

CIDR Length	Mask	# of Networks	#  of Hosts
/1	128.0.0.0	128 A	2,147,483,392
/2	192.0.0.0	64 A	1,073,741,696
/3	224.0.0.0	32 A	536,870,848
/4	240.0.0.0	16 A	268,435,424
/5	248.0.0.0	8 A	134,217,712
/6	252.0.0.0	4 A	67,108,856
/7	254.0.0.0	2 A	33,554,428
/8	255.0.0.0	1 A	16,777,214
/9	255.128.0.0	128 B	8,388,352
/10	255.192.0.0	64 B	4,194,176
/11	255.224.0.0	32 B	2,097,088
/12	255.240.0.0	16 B	1,048,544
/13	255.248.0.0	8 B	524,272
/14	255.252.0.0	4 B	262,136
/15	255.254.0.0	2 B	131,068
/16	255.255.0.0	1 B	65,024
/17	255.255.128.0	128 C	32,512
/18	255.255.192.0	64 C	16,256
/19	255.255.224.0	32 C	8,128
/20	255.255.240.0	16 C	4,064
/21	255.255.248.0	8 C	2,032
/22	255.255.252.0	4 C	1,016
/23	255.255.254.0	2 C	508
/24	255.255.255.0	1 C	254
/25	255.255.255.128	2 subnets	124
/26	255.255.255.192	4 subnets	62
/27	255.255.255.224	8 subnets	30
/28	255.255.255.240	16 subnets	14
/29	255.255.255.248	32 subnets	6
/30	255.255.255.252	64 subnets	2
/31	255.255.255.254	none	none
/32	255.255.255.255	none	1

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