How can I find out if the domain I'm interested in is occupied?

This can be done on the domain registration service page, or in your personal account, when you are registering a domain. It has exactly the same form for domain validation. Just enter the domain name and mark the desired zones (for example .com or .net) and click on the “Check” button. A form will be displayed below, in which all unoccupied domains will be marked green. By clicking on the link, you will be able to register your domain immediately.