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.

Frequently Asked Questions — Subnet & CIDR IP Range Calculator

Is Subnet & CIDR IP Range Calculator free to use?

Yes, Subnet & CIDR IP Range Calculator is completely free with no limits, no watermark, and no signup. It runs 100% in your browser.

Does Subnet & CIDR IP Range Calculator upload my files to a server?

No. Subnet & CIDR IP Range Calculator processes everything locally in your browser using Developer — Network & Systems client-side engines (Canvas, pdf-lib, FFmpeg WASM, Tesseract). Your data never leaves your device.

How do I use Subnet & CIDR IP Range Calculator?

Open Subnet & CIDR IP Range Calculator at https://utility.rajlabs.in/cidr-calculator, enter or upload your data, adjust presets — results update live. Then copy, download or share via URL. You can also install it as a PWA for one-tap offline access.

How to use Subnet & CIDR IP Range Calculator

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 your browser.
3. Adjust presets, then copy, download or share via URL (?param=value) for reuse. Install as PWA for offline access.

Published 2024-08-15 · Updated 2026-10-07 · Open Subnet & CIDR IP Range Calculator · Browse all 157+ tools

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