/0     0.0.0.0
/1     128.0.0.0
/2     192.0.0.0
/3     224.0.0.0
/4     240.0.0.0
/5     248.0.0.0
/6     252.0.0.0
/7     254.0.0.0
/8     255.0.0.0

/9     255.128.0.0
/10    255.192.0.0
/11    255.224.0.0
/12    255.240.0.0
/13    255.248.0.0
/14    255.252.0.0
/15    255.254.0.0
/16    255.255.0.0

/17    255.255.128.0
/18    255.255.192.0
/19    255.255.224.0
/20    255.255.240.0
/21    255.255.248.0
/22    255.255.252.0
/23    255.255.254.0
/24    255.255.255.0

/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