IPAddress.dev: IP Intelligence and a Developer Toolbox in One Tab

Ask the internet what your IP address is and you get a number back. Maybe a city, if the site is feeling generous. Then you close the tab and go looking for a timestamp converter, because that's what you actually needed.

IPAddress.dev is built on the assumption that the number was never the point. Load it and you get a full read-out of your connection, plus the small pile of utilities most of us keep bookmarked and still lose track of.

What it knows about you before you click anything

The page fingerprints your connection on arrival and lays the results out across six panels. Your IPv4 and IPv6 addresses sit at the top with the reverse DNS hostname, and everything has a copy button next to it — which sounds trivial until you've tried reading an IPv6 address down the phone to a network engineer.

From there it fills in region, city and country with a map pin for the approximate location, then the part that tends to matter more: your ISP, the AS number, the remote port, and whether the address is classified as residential, commercial or hosting. That last field is the one to watch. If you're wondering why a form keeps eating your submissions or an API keeps handing you a 403, seeing your traffic labelled as hosting rather than residential usually explains it in one glance.

The rest is client-side detail: operating system, device type, screen resolution, browser and version, rendering engine, cookie status, Do Not Track, referrer, timezone with UTC offset, local time, currency and language. Useful when a bug only reproduces on someone else's machine and you need them to tell you what they're running without walking them through developer tools.

The speed test is where you already are

There's a network speed test built into the same page — download, upload and latency, updating as it runs. The measurements themselves are unremarkable, but not having to open a second site plastered in ads to get them is a small mercy. When you're debugging a shaky connection, having throughput and your ISP details on one screen saves the copy-paste dance between tabs.

The toolbox

This is the half of the site that will probably keep you coming back. The date and Unix timestamp converters work in both directions and handle millisecond precision, which is more than a lot of the throwaway converters manage. There's Base64 encode and decode, a Basic Auth header generator, and a JWT decoder that pulls apart the header, payload and expiry claims — handy when you want to check whether a token has expired without pasting it into a random site you don't recognise.

The rest is more of a mixed bag, in a good way: VAT and tax calculations with add and remove, live currency conversion, a colour picker that converts between HEX and RGB, and an HTML-to-PDF-or-Word converter. Not the tools you'd expect on an IP lookup page, but they're the sort of thing you end up needing at 5pm on a Friday.

A free API that returns the whole picture

There's a REST API behind all of this, and it hands back one JSON blob covering geolocation, ISP, parsed user agent, device detection and timezone. The free tier is 500 requests a month with access to all the basic IP fields — enough for a side project, an internal dashboard or a prototype, and honest enough about its limits that you know when you'll outgrow it.

One call, everything in it:

{
  "ip": "203.0.113.42",
  "city": "London",
  "country": "United Kingdom",
  "isp": "Example ISP",
  "timezone": "Europe/London",
  "user_agent": {
    "browser": { "family": "Chrome", "version": "126.0.0" },
    "device": { "is_mobile": false, "is_pc": true },
    "os": { "family": "Windows", "version": "11" }
  }
}

No SDK to install, no auth dance to get started. Point it at your analytics pipeline for country-level reporting, use the device flags to decide what to render, or pull the timezone so your scheduling code stops guessing.

On your phone, too

If you spend time on-site rather than at a desk, the toolkit is packaged as an app on both platforms:

• Download on the App Store (iOS)
• Get it on Google Play (Android)

Worth a bookmark?

Most IP lookup sites do one thing and monetise it with banners. IPAddress.dev bundles IP intelligence, network diagnostics and the everyday converters into one fast, ad-free page that behaves itself on a phone. Whether you're checking whether a VPN is actually routing your traffic, seeing what headers a client is really sending, or converting a timestamp mid-deploy, it's one tab instead of four.

Have a look at ipaddress.dev and see if it earns a spot in your bookmarks bar.