Having total control of your domains is something really crucial and being able to access and edit the DNS records for any of them is one of the things you should look for when you search for a registration or a hosting provider. Perhaps you have heard about the so-called “name servers” that show where a domain name is hosted, but below them there is a whole list of records, like the A record, which is the IP address of the server hosting the site, and the MX records, which show the server that deals with the e-mails for a certain domain. These records are used if you wish to have your website with one provider and the e-mails with another, for instance. You could also use a domain for a non-website service or direct the traffic to it using special records. Many companies ask for an additional payment to provide access to edit specific DNS records besides the name servers.