在线免费子网计算器

Yes, the 子网计算器 on Allio Tools is completely free with no sign-up or registration required. It works directly in your browser.

计算IP子网、掩码、主机范围和广播地址。 No data is sent to a server — everything runs locally in your browser for maximum privacy and speed.

No installation needed. The 子网计算器 runs entirely in your web browser on any device — desktop, tablet, or mobile.

Completely safe. The 子网计算器 processes everything locally in your browser. No input data, results, or usage information is ever transmitted to or stored on any server.

After the page loads for the first time, the 子网计算器 works without an internet connection for all client-side processing. Tools that fetch live external data (such as DNS or network lookups) require an active connection.

The 子网计算器 fetches live data in real time each time you run it. Results reflect the current state of the server or domain at the moment of the request.

Results depend on the real-time state of the target server and DNS propagation, which can vary by geographic region and caching TTL. If you see inconsistencies, wait a few minutes and re-test — DNS changes can take up to 48 hours to propagate fully worldwide.

Yes. The 子网计算器 is built with standard browser APIs and works on all modern browsers including Chrome, Firefox, Safari, and Edge — on both desktop and mobile. No plugins, extensions, or third-party software are required.

Select and copy the result text to paste into any document or app. For image tools, a Download button saves the file directly to your device. Your browser's built-in screenshot function also captures results quickly. No account or login is required.