Subnet Calculator
Calculate IPv4 and IPv6 subnets — network, broadcast, range, mask, and host count.
How to use Subnet Calculator
- Open the Subnet Calculator tool and enter or paste your input.
- Adjust any options to match what you need.
- The result updates instantly — copy or download it.
Frequently asked questions
Yes. Subnet Calculator is completely free and you do not need to create an account.
Yes. This tool runs entirely in your browser — nothing you enter is uploaded to our servers.