CIDR Calculator

Calculate IPv4 network, mask, broadcast, wildcard, and usable ranges.

CIDR Calculator
Local input
Output
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About this tool

Made for the task at hand.

Expand an IPv4 CIDR block into practical subnet details, including the conventional host range and special /31 and /32 behavior.

How to use

  1. Enter an address and prefix such as 192.168.1.42/24.
  2. Review the normalized network and subnet masks.
  3. Use the host counts and range for addressing plans.
Your work stays yours.
Tool inputs are processed locally in your browser and are never sent to KitVerse servers. Clear the workspace when using a shared device.
Common questions
How are /31 and /32 networks handled?

Both addresses are shown as usable on /31 point-to-point blocks, and the single /32 address is usable as a host route.

Can I enter an IPv6 prefix?

No. This calculator intentionally supports IPv4 CIDR blocks only.