Binary
Frequently asked questions
What input formats are accepted?
CIDR like 192.168.1.10/24, an IP plus dotted mask like 172.16.5.9 255.255.0.0, or a plain IP (assumed /24).
Why is the usable host count two less than total?
The network address and the broadcast address cannot be assigned to hosts, so a /24 has 256 addresses but 254 usable. /31 and /32 are handled as special cases.
Is this only for IPv4?
Yes. This calculator covers IPv4 only; it does not do IPv6 subnets.
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