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Subnet Calculator

Calculate network address, broadcast, host range and CIDR notation. Free online subnet calculator.

Live·100% in your browser — no upload

How Subnet Calculator works

Calculate network address, broadcast, host range and CIDR notation. Free online subnet calculator. Everything runs locally in your browser — nothing is sent to external servers.

  1. Enter or paste your data in the field above.
  2. The tool processes the result instantly, while your data stays on your device.
  3. Copy or download the output.

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