I am using ipinfodb.com to get geolocation info for IPs, but it only gives postal codes for US addresses.
I am also getting GPS coods from mobile devices, but I need to get more useful information from these GPS coods, that is the country, state, city and postalcode of that GPS coods.
Two questions, 1) is there a more comprehensive database than ipinfodb.com that will get postal codes for IPs outside of the US? 2) is there a way to get address information from GPS coods (including places outside the US).
MaxMind offers a free version of their GeoCity database.
http://www.maxmind.com/app/geolitecity
Also, there is an open source, free-to-use web service at:
http://hostip.info
Both should provide comprehensive location data.