Just like DC5 is often down to the discontent of Chinese users, DC2 is the one serving all Russian and Ukrainian users, so in the more technical Russian-speaking communities "dc2 down" is also a pretty common saying
The DC3 gap is interesting. I wonder whether they deprecated it because the other EU server had plenty of capacity, or still keep it but only for... "special" account data flow.
DC2 is the first connection point of all MTProto clients.
Any DC may refuse a request and force the client to switch DC.
Profile URL doesn't show where messages/chats/channels are stored, as telegram has two dedicated DCs mostly for media. The rest DCs allow media with bandwidth being throttled.
They claim that they store user data on different servers in different jurisdictions so it becomes more difficult for authorities to gain access [1]. Maybe that's true and it has something to do with these DCs that seem to be unused.
They do not claim that. They do claim that they store specifically encryption keys in several data centers in different jurisdictions. Here is the exact quote: "All data is stored heavily encrypted and the encryption keys in each case are stored in several other data centers in different jurisdictions". So only keys are distributed.
What does heavily encrypted even mean? Fully encrypted? Slightly encrypted? Encrypted enough to call it “heavily encrypted” but not enough to be protected from whoever is interested?
It's more about the fact that five eyes intelligence services prefer to officially spy on each other's countries so they don't have to answer to their respective bureaucrats. They prefer plausible deniability.
Something like this:
DC1 politically belongs to UK which "spies" on CA/US but physical servers are located in US so US ultimately retains control.
DC2 politically belongs to France which "spies" on RUS/UKR/DE but physical servers are located in NL (e.g. in UK because one wouldn't be able to spot difference in ping). Maybe it's politically owned by UK/NZ or UK/AUS because France can't be publicly caught spying on Germany. But France wouldn't risk public arrest of Telegram CEO and the spectacle with russia if there is nothing to gain.
DC4 politically belongs to USA which "spies" on UK/Israel but physical servers are in NL/UK
DC5 politically belongs to UK/USA which "spies" on AUS/China/India but physical servers are in Singapore (e.g. former UK colony)
I love mentioning the UK in these kind of discussions because the pushback is biggest every time the Crown is mentioned, and ultimately US/CA/NZ/AUS are all colonies under the King.
Really cool to see realpolitik mapped out like this. It also highlights the problem of metadata with these kind of topics.
It makes sense: European users are assigned to EU data center, and Chinese to the one closer to them. The "custom code" should not be complicated, just a map of country to DC.
You are suggesting to develop a compicated solution (spend money) when current simple one is working ok without any elections.
If you've ever actually tried to implement server clustering you quickly find there's no magic cloud, except in specific cases like blockchains. A privately operated cluster system is mostly about directing requests to the correct server out of a finite set of servers.
DC in Miami, explains why Telegram app is snappy fast for me. I notice similar speed improvement with Meta and other big tech apps when I'm on the west coast. I guess latency matters when your app is making tons of requests.
Most of big tech's major data centers are in Loudoun County, VA on the east coast not the west coast. It's centrally located to be great latency for the east coast and OK latency for west coast and Europe. Plus a friendly regulatory environment and lots of existing DCs (AWS us-east-1, Azure East US 1/2)
If you're feeling any better latency on the west coast it's more likely to be placebo than real.
idk, they probably tried to get people on DC's as close to their location as possible. Using your phone number's country code might seem like a good way to do this at first, and they probably didn't give it much more thought before building the whole thing on this idea.
Beautiful analysis. It really looks like the country distribution [1] follows the geographical split between five eyes intelligence services, and maybe a small slice for France after they imprisoned the Telegram CEO [2] in order to take over data ownership from russia.
The Lex Fridman podcast episode with Pavel Durov is worth listening to. Their servers are built to be very secure — of course, it would be different for others, and they use some clever tricks
Good story, I yet believe the guy is trying to do the right thing. In the lex Friedman podcast he talks about banning extremist channels in both sides always, the story focus more on the Nalvani's block, but accordingly him he also bans other sides depending on the content.
I do follow a number of Telegram channels about the Ukraine war, and the pro Ukraine channels are there together with pro Russian channels.
Of course he would say that. Even besides the fallaciousness of this argument (there is no equivalence between an aggressor and a victim), Pavel Durov is completely untrustworthy.
There is product stuff, like misleading claims about Telegram's encryption and comparisons to Signal. In reality, for the vast majority of chats they have plaintext, unlike Signal.
There are more subtle positioning claims. Durov made a huge deal of his "exile", but I saw Telegram's office in St Petersburg with my own two eyes a year after Durov "fled the country". It definitely wasn't shut. There were even local news of Pavel assaulting a guy in St Petersburg for trying to make a photo of him a couple years later.
And then there are just completely unnecessary lifestyle claims. He said multiple times how he doesn't take any "pills" or medications. It only takes a minute to find his old photos. Male pattern baldness doesn't stop progressing without DHT suppression, and last time I checked, finasteride comes in pills. I don't understand why would he make misleading statements about something so visible, but it doesn't make him any more trustworthy.
Also, it looks like it's easy enough to ID your DC on their API, though I haven't tried it yet (more of a Matrix Stan personally): https://core.telegram.org/method/help.getConfig
It's a capital T.
Any DC may refuse a request and force the client to switch DC.
Profile URL doesn't show where messages/chats/channels are stored, as telegram has two dedicated DCs mostly for media. The rest DCs allow media with bandwidth being throttled.
[1] - https://telegram.org/privacy
Something like this:
I love mentioning the UK in these kind of discussions because the pushback is biggest every time the Crown is mentioned, and ultimately US/CA/NZ/AUS are all colonies under the King.Really cool to see realpolitik mapped out like this. It also highlights the problem of metadata with these kind of topics.
Why not a sticky master election per user, and have no special data centers?
You are suggesting to develop a compicated solution (spend money) when current simple one is working ok without any elections.
If you're feeling any better latency on the west coast it's more likely to be placebo than real.
• Quincy, WA (Microsoft)
• The Dalles, Oregon (Google)
• Prineville, Oregon (Facebook, Apple)
• Hillsboro, Oregon (Cloudflare, others)
• Boardman, Oregon (AWS)
[1] https://dev.moe/wp-content/uploads/2022/05/image-14.png
[2] https://en.wikipedia.org/wiki/Arrest_and_indictment_of_Pavel...
(and a follow-up: https://istories.media/en/news/2025/06/10/telegram-responds-... )
There is product stuff, like misleading claims about Telegram's encryption and comparisons to Signal. In reality, for the vast majority of chats they have plaintext, unlike Signal.
There are more subtle positioning claims. Durov made a huge deal of his "exile", but I saw Telegram's office in St Petersburg with my own two eyes a year after Durov "fled the country". It definitely wasn't shut. There were even local news of Pavel assaulting a guy in St Petersburg for trying to make a photo of him a couple years later.
And then there are just completely unnecessary lifestyle claims. He said multiple times how he doesn't take any "pills" or medications. It only takes a minute to find his old photos. Male pattern baldness doesn't stop progressing without DHT suppression, and last time I checked, finasteride comes in pills. I don't understand why would he make misleading statements about something so visible, but it doesn't make him any more trustworthy.