Julie Mogenthal's List: DNS

This step-by-step article shows you how to use Host Headers to allow multiple host names to share a single IP address.

IIS allows you to assign any number of sites to a single IP address and distinguish them by using host headers. When IIS receives a request for a Web page, it looks at the information sent in by the browser. If the browser is HTTP 1.1 compliant (Internet Explorer 3.x and later, or Netscape Navigator 3.x and later), the HTTP header contains the actual domain name requested. IIS uses this to determine which site should answer the request.