How can I use Google API to obtain the Geolocation of an IP address?

I'm looking for a free service for locating an IP Address getting its City, Country, Latitude and Longitude. I believe that I can get the geo-location of an IP using the Google API. Has anyone done t开发者_Python百科hat before? Any insights?

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I use this: http://isithackday.com/hacks/geo/yql-geo-library/ for my fallback when a device does not have GPS.

Best,

T