Hi Karyan,

You can set up multiple hosts on the same site within the Episerver admin > Config tab > Manage Websites. Click on the site you want to manage your hosts for and add any domains you need - you don't need an additional license to add hosts to a site, only to create new sites. As shown below, you can also use a wildcard to map any unmapped domain to a given site.

To restrict CMS access to a single domain (for example 'alloy.edit') you can use rewrite rules inside your web.config like this:

<rewrite>
  <rules>
    <rule name="Restrict CMS access" stopProcessing="true">
      <match url="^episerver/" />
      <conditions>
        <add input="{HTTP_HOST}" pattern="^alloy.edit$" negate="true" />
      </conditions>
      <action type="CustomResponse" statusCode="404" statusReason="Not Found" statusDescription="Not Found" />
    </rule>
  </rules>
</rewrite>