How to get user's geolocation?

Question

On many sites I saw printed out my current city where I am (eg \"Hello to Berlin.\"). How they do that? What everything is needed for that? I guess the main part is here jav

Answer 1

Internet Service Providers buy up big chunks of IP addresses, so what you're most likely seeing is a backtrace your IP to a known ISP. They have a database with ISP's and their location in the world, so they can try to see where you're from. You could try to use a site like http://www.ipaddresslocation.org/ to do your work. If you look around, there is bound to be a site that lets you enter an IP and get a location, so you just send a POST request to that site with your visitor's IP and scrape the location from the response.

Alternatively you could try to look for an ISP database that has location and what chunks of the IP range they have been allocated. You could probably find one for money, but a free one might be harder to find. Alternatively, check out this free database http://www.maxmind.com/app/geolite