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IPv4 Subnet Calculator

Calculate an IPv4 network, mask, broadcast, and usable range locally.

This tool runs in your browser.
Enter an IPv4 CIDR.

How to use

  1. 01Enter an IPv4 address and prefix.
  2. 02Calculate the network locally.

FAQ

Does this scan a network?

No. It only calculates the address range.

IPv4 Subnet Calculator: Can I use the result in production?

Treat generated, converted, or inspected output as a development aid. Validate security-sensitive values, commands, and configuration in the target environment before production use.

Does IPv4 Subnet Calculator upload my input?

TrueFree Tools processes the input in your browser and does not store it on our servers. Features that need browser permissions or access to a user-supplied address still follow the notice shown in the tool.