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IPv4 Subnet Calculator — Masks, Ranges & Hosts

Calculate network, broadcast and usable host ranges

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Features

  • Network & broadcast
  • Usable hosts
  • Mask dotted
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This tool runs on your device — your files and inputs never go anywhere.

How to Use IPv4 Subnet Calculator

Calculate network, broadcast and usable host ranges No signup, and nothing gets uploaded for most use.

  1. 1

    Enter your numbers in the input fields.

  2. 2

    Choose the calculation options or frequency.

  3. 3

    The result updates instantly as you type.

  4. 4

    Review the breakdown, chart, or schedule, and copy the answer.

Why you might like it

  • Nothing to upload — the work happens on your device.
  • Free with no signup, no watermarks, and no daily limits.
  • Works in any modern browser on any device — nothing to install.
  • Usually done in a few seconds, so it doesn't get in your way.
Try Subnet

Frequently Asked Questions

What is a subnet mask?▾

A subnet mask marks which bits of an IPv4 address identify the network and which identify the host. A /24 mask is 255.255.255.0 and leaves 8 host bits.

Why are the first and last addresses special?▾

The network address (all host bits zero) identifies the subnet itself, and the broadcast address (all host bits one) reaches every host on it. Neither is usable as a host.

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