128 | 1 0 0 0 0 0 0 0 (i.e. 1 Bit ON and 7 OFF)
192 | 1 1 0 0 0 0 0 0 (i.e. 2 Bits ON and 6 OFF)
224 | 1 1 1 0 0 0 0 0 (i.e. 3 Bits ON and 5 OFF)
240 | 1 1 1 1 0 0 0 0 (i.e. 4 Bits ON and 4 OFF)
248 | 1 1 1 1 1 0 0 0 (i.e. 5 Bits ON and 3 OFF)
252 | 1 1 1 1 1 1 0 0 (i.e. 6 Bits ON and 2 OFF)
254 | 1 1 1 1 1 1 1 0 (i.e. 7 Bits ON and 1 OFF)
255 | 1 1 1 1 1 1 1 1 (i.e. 8 Bits ON and 0 OFF)
Subnet Mask CIDR Value
CLASS A
255.0.0.0 /8
255.128.0.0 /9
255.192.0.0 /10
255.224.0.0 /11
255.240.0.0 /12
255.248.0.0 /13
255.252.0.0 /14
255.254.0.0 /15
