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Subnet Calculator

With this free online Subnet / VLSM / CIDR calculator you can subnet IPv4 addresses using the fields below. The result below will show you information about the subnetted network, such as number of addresses in span, the first and last useable address, the reverse DNS for the IP etc.


First IP in span:
Last IP in span:

IP-adresses in span:
Useble adresses:

Wildcard mask:

Reverse DNS: