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Subnet IP Ranges Cheat Sheet by

IP and Subnet ranges
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Class A

CIDR
Addresses
Wildcard
Mask
/8
16777216
0.255.255.255
255.0.0.0
/9
8388608
0.127.255.255
255.128.0.0
/10
4194304
0.63.255.255
255.192.0.0
/11
2097152
0.31.2­55.255
255.22­4.0.0
/12
1048576
0.15.2­55.255
255.24­0.0.0
/13
524288
0.7.25­5.255
255.24­8.0.0
/14
262144
0.3.25­5.255
255.25­2.0.0
/15
131072
0.1.25­5.255
255.25­4.0.0

Class B

CIDR
Addresses
Wildcard
Mask
/16
65536
0.0.255.255
255.255.0.0
/17
32768
0.0.127.255
255.255.128.0
/18
16384
0.0.63.255
255.255.192.0
/19
8192
0.0.31.255
255.25­5.224.0
/20
4096
0.0.15.255
255.25­5.240.0
/21
2048
0.0.7.255
255.25­5.248.0
/22
1024
0.0.3.255
255.25­5.252.0
/23
512
0.0.1.255
255.25­5.254.0
 

Class C

CIDR
Addresses
Wildcard
Mask
/24
256
0.0.0.255
255.255.255.0
/25
128
0.0.0.127
255.255.255.128
/26
64
0.0.0.63
255.25­5.2­55.192
/27
32
0.0.0.31
255.25­5.2­55.224
/28
16
0.0.0.15
255.25­5.2­55.240
/29
8
0.0.0.7
255.25­5.2­55.248
/30
4
0.0.0.3
255.25­5.2­55.252

Reserved Ranges

Beginning
End
10.0.0.0
10.255.25­5.255
127.0.0.0
127.25­5.2­55.255
172.16.0.0
172.31.25­5.255
192.16­8.0.0
192.16­8.2­55.255

Classful Ranges

A
0.0.0.0
127.25­5.2­55.255
B
128.0.0.0
191.25­5.2­55.255
C
192.0.0.0
223.25­5.2­55.255

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Comments

Fanch Fanch, 11:23 4 Nov 14

Mistake in Class C
/29 has 8 addresses, not 18.

BadSheep BadSheep, 10:59 3 Feb 15

Whoops, thanks. Fixed. :)

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