A reverse DNS record (also know as a PTR record), is a reverse mapping from IP to name. For instance, when a lookup is made on the IP of 188.8.131.52, it should come back with host.mydomain.com. It is a very good idea to have the hostname of your server match the PTR record assigned to it's IP. This can only be changed by the owner of the IP address
If you want to setup a reverse pointer for your IP address, please post a ticket at support or contact us via Live chat along with hostname and IP address information (host.yourdomain.com – 184.108.40.206). We will setup a PTR record for you.