geolocalise.me

These tools are actually four: IP address, GPS, cellphone towers, and WiFi.

Your IP Address is a number that is assigned to your computer when it is participating in a connected network, like the Internet. Internet service providers often are responsible for ranges of IP addresses so many services can take your IP address and pass it through a database to then determine your location down to a fairly broad area (think to the county).

The simplest way to calculate position is using GPS coordinates. Modern phones are GPS-enabled, and are able to send a signal to several satellites in space that help triangulate your exact position. GPS calculations typically rely on having a clear line of sight to the sky, so they can be not accurate indoors.

Calculating location based on cell phone towers, known as GSM localization, works much like GPS. A cell phone signal is triangulated between three cell phones towers to help determine the user’s location.