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Network & Infrastructure utility

CIDR Calculator

Calculate IPv4 network boundaries, netmask, broadcast, and usable host count.

● This tool runs entirely in your browser. Your input is never uploaded to our servers.
Output
Your result will appear here…

How to use CIDR Calculator

  1. Enter an IPv4 address with a prefix, such as 192.168.1.10/24.
  2. Select Calculate to see network and host range details.
  3. Review /31 and /32 results according to your network use case.

Example

Input:

192.168.1.10/24

Output:

Network: 192.168.1.0
Netmask: 255.255.255.0
Broadcast: 192.168.1.255
Usable hosts: 254

Use cases

About this tool

Calculate IPv4 network boundaries, netmask, broadcast, and usable host count. Processing happens locally in your browser, so your input is not sent to a server or included in analytics.

Frequently asked questions

Does this support IPv6?

No. This calculator accepts IPv4 CIDR notation only.

How are /31 and /32 hosts counted?

The tool reports all addresses as usable for /31 and /32, following point-to-point and single-address conventions.

Is an IP lookup performed?

No. Calculations use only the address you enter and no network request is made.

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