List of roblox servers with DDoS protection (udmux enabled)

Here are the list of udmux protected servers as of 1-24-22:

Los Angeles: (10.208.#.#)
Amsterdam: (10.176.#.#) (Rare, EU including Netherland players need to rejoin a few times)
Singapore: (10.20.#.#)
Sydney: (10.60.#.#)
Miami: (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:
Amsterdam: 128.116.121.*
Los Angeles: 128.116.116.*
Miami: 128.116.45.*
Singapore: 128.116.50.*
Sydney: 128.116.51.*

Inspired by thread

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.


Wait, so ONLY select servers have protection?? Why is that??

Perhaps for costs? Doesn’t seem like their best interest to prevent it as long as it doesn’t happen to a server.

Could also be security concerns regarding how the protection works.

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As of currently, probably due to cost or infrastructure limits, I will update the list when more is released

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Roblox just purchases servers & deploys their software on those servers, this ‘protection’ isn’t apart of the roblox software, it’s apart of the server regulations, it’s a bonus, an addition I guess you could say.

Also people try to actually make bots & services to generate servers in these ranges & locations :smile:
It’s chaos


Roblox no longer purchase dedicated servers, they moved fully onto colocation in 2020, udmux is likely a hardware upgrade, that is slowly rolling out.

After observing 2 weeks of Venti crashing, I have observed that when a LA server spawn, the attack pauses and ashburn server is made, resulting in players being sent there and LA server shutting down, when that happens attack continues, I have also tried to spawn Netherlands server, when that happens same thing but london server is used

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Oh? Good to know, is there a source to go with this as well so I can have a quick real about it? And yeah, the ‘Hardware Upgrade’ is what I mean by the server regulations :smile:

Regarding server downtime & crashing, yeah I am sorry for that, there are some really low players on roblox who for some reason feel it is important to commit a crime on a games platform :joy:

I tried once to counter a DDoS and the most I could do was detect it, then post that message off to a discord/guilded webhook. (this is through Lua, no other applications involved.)

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for Venti, it is what I observed, for the servers, there are many articles including techcrunch published how roblox completely changed its tech stack which shows that roblox moved from cloud computing provider to own datacenters

For the hardware upgrade, not confirmed or anything but what is used is likely NAT, and a new switch providing hardware ddos mitigation. the switch is extremely expensive.

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Why did you replace parts of the address with **#**s?

Since it could be anything, such as on one server I played it was and the other was