If you don't want to use your IP you can go onto DynDNS.com - Managed DNS, Domain Names and more! and sign up and get yourself a unique dns which will later on become your realmlist address. I know there are several guides in the "Guides" section @ArcEmu/Ascent section about how to make your server online, you should check there. There are dozens of registrations pages that you can download for free and setup easily, you will be able to find registration/CMS sites here as well, I suggest you use the search function.