Free IP Address & Network Toolkit: Check Your IP, Calculate Subnets, and More

If you’ve ever needed to find your IP address, calculate a subnet mask, or figure out what a mysterious port number means, you know how scattered the good tools are. One site does IP lookups. Another does subnet math. A third has a half-decent port reference buried in an old forum post. We built IP Intel to put all of it in one place — free, fast, and privacy-respecting.

You can try the tool yourself further down this page. First, here’s what it does and why each feature is actually useful, not just a novelty.

What Is My IP Address, and Why Does It Matter?

Every device connected to the internet is assigned an IP (Internet Protocol) address — a numeric label that lets other computers know where to send data. Think of it like a postal address for your device. There are two IP addresses worth knowing about:

• Your public IP is the address your internet provider assigns your router. It’s what websites and services see when you connect to them.
• Your private (local) IP is the address your router assigns to each device on your home or office network — your laptop, phone, printer, and so on. These addresses aren’t visible to the outside internet.

Knowing your public IP is useful for troubleshooting network issues, setting up remote access, configuring a VPN, or just confirming whether your connection is behaving the way you expect. IP Intel gives you a one-tap link to a reliable, independent IP lookup service so you can check this instantly.

Device Location, Without the Guesswork

Public IP-based location lookups are often wildly inaccurate — sometimes off by an entire city or state, because they’re based on your ISP’s registered address rather than your actual position. IP Intel takes a more accurate approach for a different use case: it can use your device’s own GPS or Wi-Fi positioning (with your permission) to show your actual coordinates on an interactive map. This runs entirely through your browser’s built-in location permission — nothing is transmitted to any server to calculate it.

This is handy for confirming a device’s exact location before sharing coordinates with someone, testing location-based app behavior, or simply satisfying curiosity about how accurate your device’s GPS really is.

Subnet and CIDR Calculator: Networking Math Made Simple

If you work with routers, servers, or home networking equipment, you’ve probably run into CIDR notation — something like 192.168.1.0/24. That slash-and-number combination defines how many devices a network can hold and where its boundaries are, but doing the binary math by hand is tedious and error-prone.

The subnet calculator in IP Intel takes any CIDR block and instantly returns:

• Network address and broadcast address
• Subnet mask and wildcard mask
• Total addresses and usable host addresses
• The first and last usable host in the range

Whether you’re configuring a home lab, setting up VLANs at work, or just studying for a networking certification, this turns a multi-step manual calculation into a one-click answer.

IP Range Generator

Sometimes you don’t need a full subnet — you just need to list out every address between a start and end point, for example when configuring a DHCP reservation range or documenting which addresses are in use. Enter a start and end IPv4 address, and the tool lists every address in between, ready to copy.

Common Ports and HTTP Status Codes, at a Glance

Two of the most-searched networking references, built right in:

• Common ports table — a quick lookup of well-known TCP/UDP ports (like 443 for HTTPS, 22 for SSH, or 3306 for MySQL) and what service typically runs on them. Useful when you’re reading firewall logs, configuring port forwarding, or just trying to remember what a port number means.
• HTTP status codes table — every common response code from 200 OK to 404 Not Found to 503 Service Unavailable, with plain-language explanations. Handy for developers, site owners diagnosing broken links, or anyone staring at an error page trying to understand what went wrong.

Browser and Local Network Info

Curious what a website can actually detect about your browser without you typing anything in? The Browser Info tab shows you exactly what’s visible from client-side JavaScript alone — your user agent string, language settings, timezone, screen resolution, and more. It’s a good reality check for privacy-conscious users who want to understand their own digital fingerprint.

There’s also a local network IP detector using WebRTC, which can reveal local (LAN) IP addresses in some browser configurations — useful for network diagnostics, though modern browsers increasingly restrict this by default (which is expected, not a bug).

DNS and WHOIS Lookups

Need to check a domain’s DNS records or find out who registered it? IP Intel gives you one-tap links to trusted DNS and WHOIS lookup services, so you don’t have to remember which site does what. Just type in a domain and go.

Built for Speed and Privacy

Most of IP Intel’s tools — the subnet calculator, range generator, reference tables, device location, browser info, and history — run entirely inside your browser. No data is sent to our servers to perform these calculations, and nothing is tracked. Your search history and favorites are stored locally on your own device, and you can clear them anytime with one click. For lookups that genuinely require an internet connection (like checking your public IP or running a WHOIS search), the tool simply opens a trusted, independent service in a new tab.

Frequently Asked Questions

Is this tool free to use? Yes, completely free, with no account or sign-up required.

Does the tool store my search history? Only in your own browser. History and favorites are saved locally so you can revisit past lookups, and you’re always in control — clear it anytime from the History panel.

Can I export my results? Yes. After running a calculation or looking up your device location, use the export button to download your results as JSON or plain text, or print them directly.

Does this work on mobile? Yes, the entire toolkit is fully responsive and works on phones, tablets, and desktops alike.

Why does my “local IP” show as blank or “None exposed”? That’s expected behavior in most modern browsers, which restrict access to local network details by default for privacy reasons. It’s not a malfunction.

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Ready to try it? The full toolkit is embedded below — no download, no sign-up, just open a tab and start checking.