How Preview DNS Works
Preview DNS lets you test your Web site prior to launch to ensure it displays and behaves properly on our hosting servers before modifying your domain's DNS record.
When you enable Preview DNS, a subdomain is created on our server that temporarily houses your Web site. If Preview DNS is applied to www.coolexample.com, the preview URL is www.coolexample.com.previewdns.com.
Accessing your site through the Preview DNS URL causes our servers to redirect to the existing live site. Any internal links in the code are translated to point to the Preview DNS site. This process ensures that all paths can be tested appropriately prior to pointing your DNS record to our hosting servers.
For additional information, see:
Using Preview DNS
What is Preview DNS?