Active Server Pages (ASP), also known as Classic ASP or ASP Classic, was Microsoft’s first server-side script engine for dynamically generated web pages. Initially released as an add-on to Internet Information Services (IIS) via the Windows NT 4.0 Option Pack (ca. 1996), it was subsequently included as a free component of Windows Server (since the initial release of Windows 2000 Server). ASP. NET has superseded ASP.