There is provided a system and process of delivering online media content files to websites which are not capable of being blocked. The system and process provides a publisher with a sub-domain name that is pointed to an IP provided by an ad server and ask publisher to update his DNS records. Concurrently, the system delivers the user a script on the newly suggested sub domain that publisher inserts in HEAD tag of web pages where it is determined that the unblockable ads are to be displayed.