network:cidr [nUxi Wiki]

CIDR table

CIDR         Mask           #Class                
----------   -------------- ------
/0           0.0.0.0         256 A
/1           128.0.0.0       128 A
/2           192.0.0.0        64 A
/3           224.0.0.0        32 A
/4           240.0.0.0        16 A
/5           248.0.0.0         8 A
/6           252.0.0.0         4 A
/7           254.0.0.0         2 A
/8           255.0.0.0         1 A
/9           255.128.0.0     128 B
/10          255.192.0.0      64 B
/11          255.224.0.0      32 B
/12          255.240.0.0      16 B
/13          255.248.0.0       8 B
/14          255.252.0.0       4 B
/15          255.254.0.0       2 B
/16          255.255.0.0       1 B
/17          255.255.128.0   128 C
/18          255.255.192.0    64 C
/19          255.255.224.0    32 C
/20          255.255.240.0    16 C
/21          255.255.248.0     8 C
/22          255.255.252.0     4 C
/23          255.255.254.0     2 C
/24          255.255.255.0     1 C
/25          255.255.255.128
/26          255.255.255.192
/27          255.255.255.224
/28          255.255.255.240
/29          255.255.255.248
/30          255.255.255.252
/31          255.255.255.254
/32          255.255.255.255