Subnet Calculator

Calculate subnet details instantly — split networks, find host ranges, and plan IP allocation. Free, accurate, runs instantly.

Instant & Fast: High-performance utility tools ready for immediate use.

Free Forever • No Watermarks • No Sign-up

How to use Subnet Calculator

Open Subnet Calculator — no account or login needed.

Select your file or input your data into the tool panel above.

Adjust the settings, dimensions, or parameters to your preference.

Click process and save your result directly to your device.

Can I split a network into equal subnets?

Yes — specify the number of subnets or hosts per subnet, and the calculator divides the network accordingly.

Does it support variable-length subnet masking?

Is my data private?

Calculate CIDR ranges, host counts, and subnet masks from CIDR notation.

Calculate subnet masks, network/broadcast addresses, and host ranges.

Expand, compress, and calculate IPv6 addresses and prefixes.

Convert IP addresses to binary representation with octet breakdown.