It is an Internet Server Application Programming Interface (ISAPI) plug-in.
BS Editor: 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.

Features:
* Redirect visitors to different web pages based on their origin
* Block visitors from specific Countries to reduce frauds
* Provide user friendly environment to visitors by originating language and currency
* Display geo-targeted advertisements to optimize advertisements income
* Avoid image leeching servers
* Avoid hotlinking and bandwidth theft
* Support for Microsoft IIS 4, 5.X, & 6 on Microsoft Windows NT/2000/XP/.NET
* Priority adjustment to avoid conflicts with other ISAPI filters
* Standalone GUI Interface for easier maintenance
* Logging functionality to let you trace back redirection request of Web site
* Compatible with ASP, ASP.NET, ColdFusion, PHP, CGI, PERL and most JSP application server environments
* Easy Backup and restore functions for server migration you can free download IP2Location ISAPI Filter 1.6.0 now.