IP Subnet Calculator
Calculate subnet mask, network, usable range, and broadcast from CIDR notation
IP Subnet Calculator
Free subnet calculator: enter a CIDR (e.g. 192.168.1.0/24) to get subnet mask, network address, first and last usable host, broadcast address, and total number of hosts. No sign-up required.
Use cases
- DevOps / sysadmin – Plan subnets for servers, containers, or VLANs
- Networking – Verify CIDR and usable IP range
- Education – Learn how subnet mask and host count work
Added Mar 6, 2026
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