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Subnet Calculator

Calculate network, broadcast, host range and usable host count from IPv4 CIDR.

Run Subnet CalculatorCalculate network, broadcast and usable host ranges.
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Run Subnet Calculator to view detailed results

What is Subnet Calculator?

A subnet calculator converts an IPv4 CIDR range into its network, broadcast address, usable host range and host count. It is useful for planning and troubleshooting IP addressing.

When to use this tool

  • Check public network or website information quickly.
  • Diagnose connectivity and configuration issues.
  • Verify results while troubleshooting.
  • Use a clear, browser-based diagnostic view.

Subnet Calculator — Frequently Asked Questions

What does the Subnet Calculator do?

Calculate network, broadcast, host range and usable host count from IPv4 CIDR.

How do I use the Subnet Calculator?

Enter the requested ipv4 cidr in the form above, then select “Calculate Subnet”. Review the returned information in the results panel.

Is the Subnet Calculator free to use?

The public Spexo networking tools are available online without a paid subscription or account for basic use.

Why can results vary or be unavailable?

Results depend on the target host, public DNS or registration data, network path, remote service availability and current conditions. Some services limit or block automated requests.