[quote]
The IIS is a multi web site server. The way is distinct the site is by the host header name. So you need to setup that on your web site.
Here is the steps that you need to follow:
http://support.microsoft.com/kb/308163 - How To Use Host Header Names to Configure Multiple Web Sites
http://support.microsoft.com/kb/190008 - How to Use Host Header Names to Host Multiple Sites </a>
http://www.microsoft.com/technet/prodtechnol/WindowsServer2003/Library/IIS/883a9544-3f70-4d46-a6df-bbadbd1fe7de.mspx?mfr=true - Host Header Names to Host Multiple Web Sites</a>
In general, open your web site properties, locate the Ip Address and near its there is the advanced, "multiple identities for this web site". There you need ether to add all income to this site with a star: "*", ether place the names you like to work with.
[/quote]
Source: StackOverflow