Whoever is hosting the server should be able to do DNS for it, if you are the person who registered mangazing.com. You would need to have your registrar point to the hosting service's name server for authoritative DNS.
Minecraft (game) has absolutely nothing at all to do with IIS (web server). Minecraft does not care what name resolves to it. Whether IIS needs configuration for the name depends upon whether you have your own server or whether it is a virtual host shared with other virtual hosts on the same server.