Subnet Mask Sheet

Networkmask Reverse Networkmask /CIDR Usable Size
0.0.0.0 255.255.255.255 /0 4.294.967.294 :-O
128.0.0.0 127.255.255.255 /1 2.147.483.646 128 Class ‘A’s
192.0.0.0 63.255.255.255 /2 1.073.741.822 64 Class ‘A’s
224.0.0.0 31.255.255.255 /3 536.870.910 32 Class ‘A’s
240.0.0.0 15.255.255.255 /4 268.435.454 16 Class ‘A’s
248.0.0.0 7.255.255.255 /5 134.217.726 8 Class ‘A’s
252.0.0.0 3.255.255.255 /6 67.108.862 4 Class ‘A’s
254.0.0.0 1.255.255.255 /7 33.554.430 2 Class ‘A’s
255.0.0.0 0.255.255.255 /8 16.777.214 1 Class ‘A’
255.128.0.0 0.127.255.255 /9 8.388.606 128 Class ‘B’s
255.192.0.0 0.63.255.255 /10 4.194.302 64 Class ‘B’s
255.224.0.0 0.31.255.255 /11 2.097.150 32 Class ‘B’s
255.240.0.0 0.15.255.255 /12 1.048.574 16 Class ‘B’s
255.248.0.0 0.7.255.255 /13 524.286 8 Class ‘B’s
255.252.0.0 0.3.255.255 /14 262.142 4 Class ‘B’s
255.255.0.0 0.0.255.255 /16 65.534 1 Class ‘B’
255.255.128.0 0.0.127.255 /17 32.766 128 Class ‘C’s
255.255.192.0 0.0.63.255 /18 16.382 64 Class ‘C’s
255.254.0.0 0.1.255.255 /15 13.107 2 Class ‘B’s
255.255.240.0 0.0.15.255 /20 4.094 16 Class ‘C’s
255.255.248.0 0.0.7.255 /21 2.046 8 Class ‘C’s
255.255.252.0 0.0.3.255 /22 1.022 4 Class ‘C’s
255.255.224.0 0.0.31.255 /19 819 32 Class ‘C’s
255.255.254.0 0.0.1.255 /23 510 2 Class ‘C’s
255.255.255.0 0.0.0.255 /24 254 1 Class ‘C’
255.255.255.128 0.0.0.127 /25 126 128 Hosts
255.255.255.192 0.0.0.63 /26 62 64 Hosts
255.255.255.224 0.0.0.31 /27 30 32 Hosts
255.255.255.240 0.0.0.15 /28 14 16 Hosts
255.255.255.248 0.0.0.7 /29 6 8 Hosts
255.255.255.252 0.0.0.3 /30 2 4 Hosts
255.255.255.255 0.0.0.0 /32 1 1 Host
255.255.255.254 0.0.0.1 /31 0 2 Hosts