CIDR - Classless Inter-Domain Routing Guide 
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- RFC 1123 

- /n -> n=number of bits in mask

Prefix Netmask           Binary                            Number of Networks
------ -------           ------                            ------------------
/1     128.0.0.0         10000000000000000000000000000000  128 Class A domains
/2     192.0.0.0         11000000000000000000000000000000  64  Class A domains
/3     224.0.0.0         11100000000000000000000000000000  32  Class A domains
/4     240.0.0.0         11110000000000000000000000000000  16  Class A domains
/5     248.0.0.0         11111000000000000000000000000000  8   Class A domains
/6     252.0.0.0         11111100000000000000000000000000  4   Class A domains
/7     254.0.0.0         11111110000000000000000000000000  2   Class A domains
/8     255.0.0.0         11111111000000000000000000000000  1   Class A domain
/9     255.128.0.0       11111111100000000000000000000000  128 Class B domains
/10    255.192.0.0       11111111110000000000000000000000  64  Class B domains
/11    255.224.0.0       11111111111000000000000000000000  32  Class B domains
/12    255.240.0.0       11111111111100000000000000000000  16  Class B domains
/13    255.248.0.0       11111111111110000000000000000000  8   Class B domains
/14    255.252.0.0       11111111111111000000000000000000  4   Class B domains 
/15    255.254.0.0       11111111111111100000000000000000  2   Class B domains
/16    255.255.0.0       11111111111111110000000000000000  1   Class B domain
/17    255.255.128.0     11111111111111111000000000000000  128 Class C domains
/18    255.255.192.0     11111111111111111100000000000000  64  Class C domains
/19    255.255.224.0     11111111111111111110000000000000  32  Class C domains
/20    255.255.240.0     11111111111111111111000000000000  16  Class C domains
/21    255.255.248.0     11111111111111111111100000000000  8   Class C domains
/22    255.255.252.0     11111111111111111111110000000000  4   Class C domains
/23    255.255.254.0     11111111111111111111111000000000  2   Class C domains
/24    255.255.255.0     11111111111111111111111100000000  1   Class C domain
/25    255.255.255.128   11111111111111111111111110000000  128 hosts
/26    255.255.255.192   11111111111111111111111111000000  64  hosts
/27    255.255.255.224   11111111111111111111111111100000  32  hosts
/28    255.255.255.240   11111111111111111111111111110000  16  hosts
/29    255.255.255.248   11111111111111111111111111111000  8   hosts
/30    255.255.255.252   11111111111111111111111111111100  4   hosts
/31    255.255.255.254   11111111111111111111111111111110  2   hosts
/32    255.255.255.255   11111111111111111111111111111111  1   host