how do one determine location based on ip? I'm not asking for any product or service, but rather how to go about implementing it technically.
The ip to country is a rather static mapping. What about more specific locations?
geobyte is a good service to locate ip address. If you are thinking about an algorithm to find location based on IP, I think there is none. It is basically a database look up and you will retrieve the location based on the IP address.
来源：https://stackoverflow.com/questions/7337692/how-to-determine-location-based-on-ip