No real point in routing it through DNS except to entertain a few nerds looking at the network tab.

or, like in my case, when you've got umatrix running.

bingo

I am not the developer, nor am I associated with the project in any way, but I've seen other games similar to this do the same thing when servers are created on demand. I'm sure it's just spinning up instances of the game server as demand rises and connecting clients to the raw IP instead of having them all behind a load balancer or similar routing node with a dedicated domain name. Might just be due to the project being relatively young. Also, I could be completely wrong. This is just my best guess.