What software are you looking for ?
"IPSearchLight (www.ipsearchlight.com) for ASP.NET gives you real-time feedback on the geographic location of website visitors by their IP address alone. The technology is completely unintrusive, yet can often track a person's location to a few miles radius on the planet.
Some potential uses:
- Localization of website language, content and currency.
- Targeted advertising.
- Preventing credit card fraud.
- Geographically profiling email recipients.
- Geographic profiling of e-commerce purchasing behavior. .....