Hosting Controller allows you to Add or Delete Host Header Names.
To delete a host header name:
Login into control panel as reseller.
Click on the Domains option, present in left frame. In the main frame, existing IIS sites under the logged in user, will be displayed.
Select the site, from which you want to remove a host header name, and click on Properties button at the top of the page. Site Properties form will be displayed.
Click on Advanced button at bottom of the form. Select the Host Header name which you want to delete, in Host Header Settings dialog, and click Delete button, the host header entry will be removed to DNS.
Click Close button after deleting the host headers.