We offer complimentary DNS domain hosting for your Mac via a web interface known as ‘ISPConfig’. With this interface, you can setup DNS zones and create/edit zone records.
MacStadium engineering can setup a reverse DNS PTR record for your machine at no cost. This is essential if you are hosting a Mail server or something similar with your Mac.
Please open a support ticket for DNS record change requests.
You can also find more information about DNS zone maintenance here.