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Table of Contents

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CIDR        Total number    Network             Description:Notation:   of addresses:   Mask:--------------------------------------------------------------/0          4,294,967,296   0.0.0.0             Every IPv4 Address/1          2,147,483,648   128.0.0.0           128 /8 nets/2          1,073,741,824   192.0.0.0           64 /8 nets/3          536,870,912     224.0.0.0           32 /8 nets/4          268,435,456     240.0.0.0           16 /8 nets/5          134,217,728     248.0.0.0           8 /8 nets/6          67,108,864      252.0.0.0           4 /8 nets/7          33,554,432      254.0.0.0           2 /8 nets/8          16,777,214      255.0.0.0           1 /8 net (Class A)--------------------------------------------------------------/9          8,388,608       255.128.0.0         128 /16 nets/10         4,194,304       255.192.0.0         64 /16 nets/11         2,097,152       255.224.0.0         32 /16 nets/12         1,048,576       255.240.0.0         16 /16 nets/13         524,288         255.248.0.0         8 /16 nets/14         262,144         255.252.0.0         4 /16 nets/15         131.072         255.254.0.0         2 /16 nets/16         65,536          255.255.0.0         1 /16 (Class B)--------------------------------------------------------------/17         32,768          255.255.128.0       128 /24 nets/19         16,384          255.255.192.0       64 /24 nets/19         8,192           255.255.224.0       32 /24 nets/20         4,096           255.255.240.0       16 /24 nets/21         2,048           255.255.248.0       8 /24 nets/22         1,024           255.255.252.0       4 /24 nets/23         512             255.255.254.0       2 /24 nets/24         256             255.255.255.0       1 /24 (Class C)--------------------------------------------------------------/25         128             255.255.255.128     Half of a /24/26         64              255.255.255.192     Fourth of a /24/27         32              255.255.255.224     Eighth of a /24/28         16              255.255.255.240     1/16th of a /24/29         8               255.255.255.248     5 Usable addresses/30         4               255.255.255.252     1 Usable address/31         2               255.255.255.254     Unusable/32         1               255.255.255.255     Single host--------------------------------------------------------------Reserved Space:    0.0.0.0/8       127.0.0.0/8    192.0.2.0/24    10.0.0.0/8    172.16.0.0/12    192.168.0.0/16    169.254.0.0/16

Via: http://www.techstaty.com/cidr-cheat-sheet/