Subnet Calculator

Not really a calculator, but more so a table containing all the subnets and how many usable addresses (Subnet Size – 2 for the network and broadcast address)

Subnets Usable Addresses
Subnet Mask Class A Class B Class C Class A Class B Class C
Class A /8 255.0.0.0 1 16777214
/9 255.128.0.0 2 8388606
/10 255.192.0.0 4 4194302
/11 255.224.0.0 8 2097150
/12 255.240.0.0 16 1048574
/13 255.248.0.0 32 524286
/14 255.252.0.0 64 262142
/15 255.254.0.0 128 131070
Class B /16 255.255.0.0 256 1 65534 65534
/17 255.255.128.0 512 2 32766 32766
/18 255.255.192.0 1024 4 16382 16382
/19 255.255.224.0 2048 8 8190 8190
/20 255.255.240.0 4096 16 4094 4094
/21 255.255.248.0 8192 32 2046 2046
/22 255.255.252.0 16384 64 1022 1022
/23 255.255.254.0 32768 128 510 510
Class C /24 255.255.255.0 65536 256 1 254 254 254
/25 255.255.255.128 131072 512 2 126 126 126
/26 255.255.255.192 262144 1024 4 62 62 62
/27 255.255.255.224 524288 2048 8 30 30 30
/28 255.255.255.240 1048576 4096 16 14 14 14
/29 255.255.255.248 2097152 8192 32 6 6 6
/30 255.255.255.252 4194304 16384 64 2 2 2

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