Having complete control over your domain names is something rather necessary and to be able to access and edit the DNS records for every single one of them is one of the things you should look for when you search for a registration or a shared hosting provider. Perhaps you have heard about the so-called “name servers” that show where a domain address is hosted, but below them there is also a whole group of records, such as 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 particular domain. These records are used if you'd like to have your website with one company and the emails with another, for instance. You can also use a domain address for a non-website service or direct the traffic to it through special records. Some companies ask for an additional payment to grant access to edit specific DNS records apart from the name servers.