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IPv4 Subnet Calculator

Calculate network, netmask, host range and address counts from IPv4 CIDR.

Convert in your browser · No sign-up

Uses conventional network/broadcast exclusions for /0–/30, point-to-point handling for /31, and one host for /32. No network requests occur.

Up to 100,000 UTF-16 units per input and 1,000,000 per result. See the supported formats and examples below.

Result

Add your input or load an example, then run the tool. Your result will appear here.

How to use

  1. Calculate network, netmask, host range and address counts from IPv4 CIDR.
  2. Choose the mode or options, then run the tool.
  3. Review the result, then copy or download the TXT file.

Example

192.168.1.42/24 → network 192.168.1.0, broadcast 192.168.1.255

Details and limitations

Text stays in your browser; it is not sent to a conversion server.

Format references

Tool page updated: