It was impossible to block Telegram without affecting the work of other applications

18 April 2018
Despite the fact that the restriction of access to Telegram in Russia began on April 16, the messenger is still available to users. As Pavel Durov promised, the built-in protection from blocking made it possible to stay in touch even without using proxy servers or VPNs.As it turns out, the built-in blocking circumvention scheme used in the messenger makes the blocking of subnets of Amazon, Google or any other companies, to whose IP addresses Telegram may "move," which has already begun, senseless. The fact is that Telegram uses a service push called DC_Update. It serves to update the address of the data center with which the application communicates. This push is tied to the ID number of the device being used and comes from Google, Apple, or Microsoft servers, depending on the platform, rather than from the Telegram server. Thus, it doesn't matter how many IP addresses are blacklisted: the app will secretly receive the addresses of the messenger's new servers every time. In theory, Roskomnadzor could find out which IP addresses are used to deliver the aforementioned notifications and then block them. It is worth adding that Telegram's web version does not use DC_Update and, therefore, is very likely to remain blocked.