Netmasks (Subnet Masks), CIDR, and Hosts

 

Netmask Inverse /CIDR Usable IP Addresses
0.0.0.0 255.255.255.255 /0 4,294,967,294
128.0.0.0 127.255.255.255 /1 2,147,483,646
192.0.0.0 63.255.255.255 /2 1,073,741,822
224.0.0.0 31.255.255.255 /3 536,870,910
240.0.0.0 15.255.255.255 /4 268,435,454
248.0.0.0 7.255.255.255 /5 134,217,726
252.0.0.0 3.255.255.255 /6 67,108,862
254.0.0.0 1.255.255.255 /7 33,554,430
255.0.0.0 0.255.255.255 /8 16,777,214
255.128.0.0 0.127.255.255 /9 8,388,606
255.192.0.0 0.63.255.255 /10 4,194,302
255.224.0.0 0.31.255.255 /11 2,097,150
255.240.0.0 0.15.255.255 /12 1,048,574
255.248.0.0 0.7.255.255 /13 524,286
255.252.0.0 0.3.255.255 /14 262,142
255.254.0.0 0.1.255.255 /15 131,070
255.255.0.0 0.0.255.255 /16 65,534
255.255.128.0 0.0.127.255 /17 32,766
255.255.192.0 0.0.63.255 /18 16,382
255.255.224.0 0.0.31.255 /19 8,190
255.255.240.0 0.0.15.255 /20 4,094
255.255.248.0 0.0.7.255 /21 2,046
255.255.252.0 0.0.3.255 /22 1,022
255.255.254.0 0.0.1.255 /23 510
255.255.255.0 0.0.0.255 /24 254
255.255.255.128 0.0.0.127 /25 126
255.255.255.192 0.0.0.63 /26 62
255.255.255.224 0.0.0.31 /27 30
255.255.255.240 0.0.0.15 /28 14
255.255.255.248 0.0.0.7 /29 6
255.255.255.252 0.0.0.3 /30 2
255.255.255.254 0.0.0.1 /31 0
255.255.255.255 0.0.0.0 /32 1




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