Any of you able to match IP address to City in China with modules such as geouser?

Hey all of you in China...

I thought this might be the best way to start a discussion on our websites in China being able to find a user's location. I have seen many sites in China such as websites with classifieds, real-estate, etc. that automatically know that you are in Shanghai, Beijing, Guangzhou, etc. However, with Drupal, I have never been successful at doing so.

Any of you been successful at this? I have tried using the geouser module and downloaded the GeoLiteCity.Dat database from http://www.maxmind.com/app/geolitecity, yet even being in Shanghai, it was unable to determine my city. I then used my VPN in Hong Kong to try, and it did know I was originating from Hong Kong. So this works in part, but I need it working for users in China. As I said, I've seen sites to use this in China, knowing which city, at least a major one, you are in.

Any discussion on this would be helpful.