How to know Geographic location from an IP address

问题

I have created a login application in jsp/servlet in my web project and I want to know about the geographic locations of different users those access my login page. How can I know that a person is accessing my login page from where? For example: If a person is accessing a page from Canada then a record will be inserted into my database such as : IP: 20.4.9.134 and location: Canada.

回答1:

I use this:

http://freegeoip.net/xml/122.169.8.137

Or

http://www.geoplugin.net/xml.gp?ip=xx.xx.xx.xx

Easy call and it throws you an xml with everything you need to know

Edit: New location for geoip

回答2:

try a geo ip database, like maxmind

this question lists a few possibilities: Reputable geo-ip location Services

回答3:

You can use the DB of MaxMind (the free version): http://www.maxmind.com/app/geolitecity

But have in mind that geolocating by IP is never too accurate and might give huge errors especially when using GPRS/EDGE/3G mobile internet.

来源：https://stackoverflow.com/questions/6437172/how-to-know-geographic-location-from-an-ip-address