CIDR Calculator

Compute IPv4 network, broadcast, mask and host ranges from CIDR in LocalKit—pure client math, no network calls.

Interactive controls load with JavaScript. Processing stays in your browser—nothing is uploaded.

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Как пользоваться

  1. Open the tool — Open this LocalKit page on www.908885.com and wait for the interactive controls to load (JavaScript required).
  2. Provide input — Paste or type your content, or adjust options. Everything stays in this browser tab—LocalKit does not upload tool payloads.
  3. Run the action — Use the primary button, or rely on live controls that update as you type, to generate the result.
  4. Copy or download — Copy the output into your editor, terminal, or documents—or download when the tool offers a file export.

Ограничения

Requires JavaScript. Extremely large inputs may slow or freeze the browser tab. Results depend on your browser APIs (Web Crypto, Canvas, Intl, WASM, etc.). There is no server-side processing quota because nothing is uploaded for computation.

Когда использовать

When you want a quick, free utility without creating an account, installing CLI tools, or sending content to an online converter.

Когда не использовать

When you need server-side integration, batch automation at scale, multi-GB pipelines, or certified compliance tooling with audit trails.

Конфиденциальность

Tool inputs are processed in your browser only. Theme, language and favorites may use localStorage; hosting/CDN may keep standard access logs (IP, UA, URL) without tool payloads.

Частые вопросы（5）

Does it support IPv6?

This calculator is IPv4-only. For IPv6 planning use specialized IPv6 subnet tools. LocalKit processes this in your browser on www.908885.com—input is not uploaded to our servers for computation.

Can I enter IP plus netmask?

Yes—forms like 10.0.0.5 255.255.255.0 as well as CIDR slash notation are accepted when the UI shows both.

How are usable hosts counted for /31 and /32?

They are special-cased: /32 is a single address; /31 is treated in a point-to-point style with two addresses.

Any network request?

None—pure integer math in the browser. LocalKit processes this in your browser on www.908885.com—input is not uploaded to our servers for computation.

What is the wildcard mask?

The wildcard mask is the bitwise NOT of the subnet mask, often used in ACL examples. Double-check vendor syntax before applying.