IP Lookup and Geolocation

Find out what address the rest of the internet sees when you connect, or look up any other address. You get the country, region, city, coordinates and time zone, plus the network it belongs to: the autonomous system number, the provider, the organisation and the type of connection. Addresses that cannot belong to anyone on the internet, such as 192.168.x.x and ::1, are recognised on the spot and answered without sending anything anywhere. The WebRTC leak check asks your own browser which addresses it would offer to a web page, and never contacts a server at all.
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Record types and address ranges, readable offline
Addresses that are not on the public internet. A block of IPv4 addresses is set aside for private use under RFC 1918: 10.0.0.0/8, 172.16.0.0/12 and 192.168.0.0/16. 127.0.0.0/8 is the loopback block and 169.254.0.0/16 is self-assigned when a device cannot reach a DHCP server. 100.64.0.0/10 is shared between a carrier and a home router, and 224.0.0.0/4, 240.0.0.0/4 and 255.255.255.255 are not host addresses at all. In IPv6 the equivalents are ::1 for loopback, fe80::/10 for one link only, fc00::/7 for private use and ff00::/8 for multicast. None of these can be geolocated, which is why this page answers them locally instead of asking a server.

What the coordinates mean. Location data attached to an address describes the network, not a person. A home connection is usually placed at the town or the exchange of the provider, a mobile connection often at the city the carrier routes through, and business or hosting addresses can be accurate to a building. Anything you see here is an estimate for the connection, not an address you can visit.

What the leak check does. A page can ask the browser to gather the network addresses it knows about, which is how video calls work without a relay. The same mechanism has been used to read the local addresses of a visitor, which can reveal internal network numbering or the real address behind a VPN. This page makes that request with no outside server configured, so nothing leaves your machine; the result shows only what your own browser was willing to hand over.