IP2Location ISAPI Filter is an Internet Server Application Programming Interface (ISAPI) plug-in that can be used with any web server running IIS, which enables you to discover in real-time, where your web visitors are coming from by IP address. You can determine what country they are by IP address. IP2Location ISAPI Filter used server variable dynamically tailor the content of your site based on your visitors country, region, city, latitude, longitude, ZIP code, ISP, domain name and so on. This ISAPI Filter is using a fast and self-contained lookup engine. No remote query or database connection required.