For months when I clicked my bookmark for Quadropolis, it gave me a DNS error.
In the first weeks I thought "Oh well, their server problems got more severe".
Then I thought "Seems like they shut it down. Wonder why it happened so quickly".
After some months I've been wondering why there is no discussion on sauerbraten.org.
Now I googled quadropolis.us and voila, you're still there. Just www.quadropolis.us is gone.

Having been on the interwebz for about 2 decades, I could imagine a few others being as stupid as me. So you might wanna do some forwarding of www.quadropolis.us. It might get you back a user or three.