My server gets ddosed quite alot on the steam query port, so i can block all
ips apart from gametracker (i have there ip range) and steam i need the steam
IP addresses which i cannot find online

Can you confirm there IP range or a list of ports there servers usually connect
from to the arma 3 server.exe query port ?

It seems a 60mpbs attack on our query port forces arma3server.exe to lock up
the entire remote desktop.

Many Thanks