I need advice on how to accurately mapping an IP address to its geographic location. There are several candidates that I figured out...
Google analytics' map overlay
open source http://www.ipligence.com/free-ip-database
I have never used any. You might have better recommendations.
One issue is that most of the mapping are based on ISP registration. It is possible that an ISP is located in one city, but the actual user is in another city. How severe is this issue and are there better solutions?
Thank you very much for your advice!