What's My IP Address

Your public IP address is the return address the internet uses to send responses back to you, and it is almost never the address your own device holds. RFC 1918 sets aside three private ranges — 10.0.0.0/8 (about 16.7 million addresses), 172.16.0.0/12 (about 1 million), and 192.168.0.0/16 (65,536 addresses) — for use inside home and office networks, and none of them are routable across the public internet. Your laptop or phone gets one of them from your router; your router holds the single public address your ISP assigns. This tool reports that public address, the one every website actually sees.

Every request your browser makes also carries a User-Agent string naming the browser and operating system, and client-side JavaScript can read your screen resolution, color depth, device pixel ratio, timezone, language, and CPU core count without asking permission. Individually these values are unremarkable and shared by millions of people. Combined, they form a browser fingerprint distinct enough to re-identify you across sites even with cookies disabled — the 2010 Panopticlick study by the EFF found that five or six such attributes made most browsers unique among hundreds of thousands tested. The panel above shows the same values a tracker would read, which is the point: it makes the invisible visible so you can audit what a VPN or a hardened browser actually hides.

Two of the panels above involve a network call, so it is worth being precise. The IP address at the top is read from your connection to this site's own server — the address our origin sees on the request — so the core lookup does not hand you to a third party. The city, region, and ISP fields are different: mapping an IP to a location requires a geo-IP database this tool does not host, so that one panel is fetched from a third-party service (ipapi.co) and your public IP is shared with them for that lookup, exactly as the label states. Everything else — resolution, timezone, user agent, device ratio, CPU cores — is read locally in your browser and sent nowhere. And a public IP maps only to a city or an ISP, typically accurate to the metro level and no better, never to a street address or a name; only your ISP, under legal process, can connect an address to a subscriber.