Here are the list of udmux protected servers as of 1-24-22:
Los Angeles: 126.96.36.199 (10.208.#.#)
Amsterdam: 188.8.131.52 (10.176.#.#) (Rare, EU including Netherland players need to rejoin a few times)
Singapore: 184.108.40.206 (10.20.#.#)
Sydney: 220.127.116.11 (10.60.#.#)
Miami: 18.104.22.168 (10.12.#.#) (Not sure how to get it up)
For people using HTTP requests to tell if a server is protected
Roblox will use a range of IPs in these IP range to send httprequest, instead of the ip used to connect to the game server:
Los Angeles: 128.116.116.*
Many roblox developers have been reporting DDoS attacks on their game, many can agree ddos has been a big issue, especially towards smaller games, and including session based games.
How to identify a protected server
Open the log file, if the server is unprotected there would be a line stating
“[FLog::Output] Connecting to x.x.x.x:[Port]”
If the server is protected, it would state something along the lines of
“[FLog::Output] Connecting to UDMUX server x.x.x.x:[Port], and RCC server 10.x.x.x:[Port]”
If your game have been experiencing unexplained lag (after checking for backdoors and vulnerabilities), ask for someone who is near the stated location to create servers and see if it helps.
IP of the game server are public information and can be found by pressing ctrl+shift+f3, in logs and even without joining the game at all and using API.
DDoS is a federal crime, you could be charged with a prison sentence of up to 10 years.