Quantity in Range SubNet Mask Hex SubNet Mask CIDR Bit Mask
1 255.255.255.255 FF.FF.FF.FF xxx.xxx.xxx.xxx/32 11111111111111111111111111111111 D Class
2 255.255.255.254 FF.FF.FF.FE xxx.xxx.xxx.xxx/31 11111111111111111111111111111110
4 255.255.255.252 FF.FF.FF.FC xxx.xxx.xxx.xxx/30 11111111111111111111111111111100
8 255.255.255.248 FF.FF.FF.F8 xxx.xxx.xxx.xxx/29 11111111111111111111111111111000
16 255.255.255.240 FF.FF.FF.F0 xxx.xxx.xxx.xxx/28 11111111111111111111111111110000
32 255.255.255.224 FF.FF.FF.E0 xxx.xxx.xxx.xxx/27 11111111111111111111111111100000
64 255.255.255.192 FF.FF.FF.C0 xxx.xxx.xxx.xxx/26 11111111111111111111111111000000
128 255.255.255.128 FF.FF.FF.80 xxx.xxx.xxx.xxx/25 11111111111111111111111110000000
256 255.255.255.0 FF.FF.FF.00 xxx.xxx.xxx.xxx/24 11111111111111111111111100000000 C Class
512 255.255.254.0 FF.FF.FE.00 xxx.xxx.xxx.xxx/23 11111111111111111111111000000000
1,024 255.255.252.0 FF.FF.FC.00 xxx.xxx.xxx.xxx/22 11111111111111111111110000000000
2,048 255.255.248.0 FF.FF.F8.00 xxx.xxx.xxx.xxx/21 11111111111111111111100000000000
4,096 255.255.240.0 FF.FF.F0.00 xxx.xxx.xxx.xxx/20 11111111111111111111000000000000
8,192 255.255.224.0 FF.FF.E0.00 xxx.xxx.xxx.xxx/19 11111111111111111110000000000000
16,384 255.255.192.0 FF.FF.C0.00 xxx.xxx.xxx.xxx/18 11111111111111111100000000000000
32,768 255.255.128.0 FF.FF.80.00 xxx.xxx.xxx.xxx/17 11111111111111111000000000000000
65,536 255.255.0.0 FF.FF.00.00 xxx.xxx.xxx.xxx/16 11111111111111110000000000000000 B Class
131,072 255.254.0.0 FF.FE.00.00 xxx.xxx.xxx.xxx/15 11111111111111100000000000000000
262,144 255.252.0.0 FF.FC.00.00 xxx.xxx.xxx.xxx/14 11111111111111000000000000000000
524,288 255.248.0.0 FF.F8.00.00 xxx.xxx.xxx.xxx/13 11111111111110000000000000000000
1,048,576 255.240.0.0 FF.F0.00.00 xxx.xxx.xxx.xxx/12 11111111111100000000000000000000
2,097,152 255.224.0.0 FF.E0.00.00 xxx.xxx.xxx.xxx/11 11111111111000000000000000000000
4,194,304 255.192.0.0 FF.C0.00.00 xxx.xxx.xxx.xxx/10 11111111110000000000000000000000
8,388,608 255.128.0.0 FF.80.00.00 xxx.xxx.xxx.xxx/9 11111111100000000000000000000000
16,777,216 255.0.0.0 FF.00.00.00 xxx.xxx.xxx.xxx/8 11111111000000000000000000000000 A Class
33,554,432 254.0.0.0 FE.00.00.00 xxx.xxx.xxx.xxx/7 11111110000000000000000000000000
67,108,864 252.0.0.0 FC.00.00.00 xxx.xxx.xxx.xxx/6 11111100000000000000000000000000
134,217,728 248.0.0.0 F8.00.00.00 xxx.xxx.xxx.xxx/5 11111000000000000000000000000000
268,435,456 240.0.0.0 F0.00.00.00 xxx.xxx.xxx.xxx/4 11110000000000000000000000000000
536,870,912 224.0.0.0 E0.00.00.00 xxx.xxx.xxx.xxx/3 11100000000000000000000000000000
1,073,741,824 192.0.0.0 C0.00.00.00 xxx.xxx.xxx.xxx/2 11000000000000000000000000000000
2,147,483,648 128.0.0.0 80.00.00.00 xxx.xxx.xxx.xxx/1 10000000000000000000000000000000