Found an additional cluster / server

I logged on a couple days ago on the US server, noticed the webpage : playrust.com/3/.
The normal one is playrust.com/1/.
Is there is two US servers, is it a cluster, or was it a test?
So now I have stuff on the playrust.com/3/ cluster and playrust.com/1/ cluster lol.

What?

Dude there are like 4 or 5 servers i think

the /3 server is the eu server

I clicked on the US server link, and it gave me the www.playrust.com/play/3 cluster