Which domain extensions are supported? Jimdo Support You can register your own custom domain if you're using a Dolphin premium plan. Available domain extensions You can choose from the following domain extensions: .at .ch .com .de .es .fr .info .it .net .nl .org Related articles Guide: Transfer a domain to Dolphin How do I register a domain for my Dolphin website? How do I use my own domain with my Dolphin website? How do I forward a domain to my Dolphin website? Where can I find the AuthCode for my domain?