In .Net 4, you can use the multipleSiteBindingsEnabled option:
<system.serviceModel>
<serviceHostingEnvironment multipleSiteBindingsEnabled="true">
</serviceHostingEnvironment>
</system.serviceModel>
Then, you won’t have to specify each address.
http://msdn.microsoft.com/en-us/library/system.servicemodel.servicehostingenvironment.multiplesitebindingsenabled.aspx