How does the IP Range Calculator work?

Enter your values into the input fields, adjust any parameters, and click Calculate. The tool processes your input instantly and displays accurate results. All calculations happen locally in your browser for privacy and speed.

Are the IP Range Calculator results accurate?

Yes, the calculator uses standard mathematical formulas and algorithms to ensure accurate results. Calculations are performed using JavaScript's built-in precision. For financial or medical decisions, always verify with a professional.

IP Range Calculator
★★★★½ 4.8 (287 ratings)
🔒 Client-side — Your data never leaves your browser ✅ 100% Free — No signup, no limits ⚡ Instant — No server processing

Q: Is the IP Range Calculator free to use?

Yes, this tool is completely free with no signup required. Everything runs locally: IP and before Length are processed on your device, never sent to a server — your data is never uploaded to any server, ensuring complete privacy and security.

Free online CIDR and IP address range calculator - Subnet mask, network/broadcast address, pure client-side

📝 InputIP

CIDRtableshow （such as 192.168.1.0/24）

orseparate Input：

before Length

⚡ commonuseCIDRpreset

10.0.0.0/8

172.16.0.0/12

192.168.0.0/16

192.168.1.0/24

0.0.0.0/0

127.0.0.0/8

/28 childnetwork

/30 childnetwork

FAQ

Q1: What isCIDRtableshow ？

CIDR（Noclass ）useIP add andbefore Lengthtableshownetwork，such as192.168.1.0/24tableshowbefore24bitisnetworkbit，after8bitishostbit.before Length small，network big：/24have256 ，/16have65536 ，/8have 1677 .

Q2: network andbroadcast havewhatdifference？

network ischildnetworkinNo.aIP（hostbitfull0），useinstandard networklocal .broadcast ischildnetworkinmostafteraIP（hostbitfull1），usein childnetworkinsideAllhostSendbroadcast. cannotseparateconfiggivedeviceusing.

Q3: availablehostnumberforwhatthantotal numberfew2？

Eachchildnetworkin，network （No.a）andbroadcast （mostaftera）protected cannotseparateconfiggivehost，soavailablehostnumber=total number-2.examplesuch as/24childnetworkhave256 ，availablehost254 .but/31childnetworkonly2 ， RFC 3021 allavailable（pointforpointlink ）.

❓ Frequently Asked Questions

Do I need to install any software?

No. IP Range Calculator is a web-based tool — just open it in your browser and start using it. No downloads, plugins, or extensions required.

Can I use IP Range Calculator on my phone?

Yes. IP Range Calculator is fully responsive and works on phones, tablets, and desktops. The interface adapts automatically to your screen size.

Is my data safe when using IP Range Calculator?

Absolutely. Everything runs locally: IP and before Length are processed on your device, never sent to a server. No data is sent to any server, so there's zero risk of data leaks. Your information stays completely under your control.

Does IP Range Calculator upload my data to a server?

No. IP Range Calculator uses client-side processing — everything runs in your browser. Your data never leaves your device, and the tool works even without an internet connection.

Is IP Range Calculator free to use?

Yes, IP Range Calculator is completely free to use. No registration or login required — all features are available immediately.

Does this tool make real network requests?

Some tools make real requests while others work locally. Check the tool description for details.

How accurate are the calculations?

Calculations use JavaScript's floating-point arithmetic with up to 15 significant digits of precision. For most practical purposes, this is more than sufficient.