Subnet & CIDR IP Range Calculator — Free Online Tool

Calculate IPv4 subnet masks, wildcard masks, network and broadcast addresses, usable host IP ranges, and split CIDR blocks into subnets. Free, fast, private — runs 100% in your browser. No uploads, no tracking. Try Subnet & CIDR IP Range Calculator online now.

Subnet & CIDR IP Range Calculator is part of Developer — Network & Systems on Rajlabs. It runs entirely in your browser — your files and text are never uploaded to a server. The same tool is available on all three primary hosts: utility.rajlabs.in, tools.rajlabs.in and utils.rajlabs.in. Bookmark https://utility.rajlabs.in/cidr-calculator or install it as a standalone app from your browser.

What you can do

Calculate IPv4 subnet masks, wildcard masks, network and broadcast addresses, usable host IP ranges, and split CIDR blocks into subnets. Free, fast, private — runs 100% in your browser. No uploads, no tracking. Try Subnet & CIDR IP Range Calculator online now. With Subnet & CIDR IP Range Calculator you get live results as you type, one-tap presets for common cases, copy buttons, download/export (PDF, PNG, CSV, JSON where applicable) and a shareable URL that remembers your inputs. Dark mode and mobile responsiveness are built in — it looks great on phone, tablet and desktop.

How to use

1. Open Subnet & CIDR IP Range Calculator at https://utility.rajlabs.in/cidr-calculator.
2. Enter or upload your data — the tool validates and previews instantly in the browser.
3. Adjust presets, then copy, download or share the result. Add ?param=value to the URL to prefill for sharing.

Why this tool is different

• Private & offline: 100% client-side — no data leaves your device. Works on slow networks after first load.
• Accurate & fast: exact constants, Indian formats (crore/lakh, IFSC, bigha) and exam presets where relevant.
• Installable: install Subnet & CIDR IP Range Calculator as its own app icon (PWA) — it opens directly to this tool.
• Free & no watermark: unlimited use, no signup, no ads covering content.

Tips

Use the category navigation to discover related tools — for example, after using Subnet & CIDR IP Range Calculator try other Developer — Network & Systems tools from the homepage. If you need a different format, the URL Lab, Code Formatter or Converters can chain your output. Found a bug or want a preset? Open an issue on GitHub — Rajlabs ships updates weekly.

FAQ

Is Subnet & CIDR IP Range Calculator free? Yes, completely free with no limits.

Do you store my data? No — everything runs locally in your browser.

Can I use it on mobile? Yes — the layout adapts to phones and can be installed as an app.

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