How to Host Multiple Web Sites Windows 2003

Obtaining and maintaining multiple IP addresses is usually a task reserved for large corporations and Internet service providers (ISPs), while assigning multiple host header names is a fairly simple procedure accomplished through IIS Manager. Your computer or network must be using a name resolution system (typically DNS) in order to use multiple host header names.

To assign a host header name

1. In IIS Manager, double-click the local computer, right-click the Web Sites folder, right-click the Web site, and click Properties.
2. On the Web Site tab, click Advanced.
3. Click Add.
4. In the appropriate boxes, type an IP address, TCP port, and host header value for your Web site.

   You can have multiple server certificates, multiple IP addresses, and multiple SSL ports per server.

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Thanks to http://techgurulive.com/2008/08/20/how-to-host-multiple-web-sites-windows-2003/