CIDR chart

cidr.sh

CIDR        Total Number        Network             Description:
Notation:   of addresses:       Mask:
--------------------------------------------------------------------
/0          4,294,967,296       0.0.0.0            All Addresses
/1          2,147,483,684       128.0.0.0          128 /8 networks
/2          1,073,741,824       192.0.0.0          64 /8 networks
/3          536,870,912         224.0.0.0          32 /8 networks
/4          268,435,456         240.0.0.0          16 /8 networks
/5          134,217,728         248.0.0.0          8 /8 networks
/6          67,108,864          252.0.0.0          4 /8 networks
/7          33,554,432          254.0.0.0          2 /8 networks
/8          16,777,214          255.0.0.0          1 /8 network
---------------------------------------------------------------------
/9          8,388,608           255.128.0.0        128 /16 networks
/10         4,194,304           255.192.0.0        64 /16 networks
/11         2,097,152           255.224.0.0        32 /16 networks
/12         1,048,576           255.240.0.0        16 /16 networks
/13         524,288             255.248.0.0        8 /16 networks
/14         262,144             255.248.0.0        4 /16 networks
/15         131,072             255.254.0.0        2 /16 networks
/16         65,536              255.255.0.0        1 /16 network
---------------------------------------------------------------------
/17         32,768              255.255.128.0      128 /24 networks
/18         16,384              255.255.192.0      64 /24 networks
/19         8,192               255.255.224.0      32 /24 networks
/20         4,096               255.255.240.0      16 /24 networks
/21         2,048               255.255.248.0      8 /24 networks
/22         1,024               255.255.252.0      4 /24 networks
/23         512                 255.255.254.0      2 /24 networks
/24         256                 255.255.255.0      1 /24 network
--------------------------------------------------------------------
/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    6 usable addresses
/30         4                   255.255.255.252    2 usable addresses
/31         2                   255.255.255.254    used in P2P links
/32         1                   255.255.255.255    single host

Thank you!