It's probably just DNS (port 53). It's the way Europeans tend to implement their censorship, with the ISPs as executors. It's trivial to bypass, but most non-technical users don't know how, so it's good enough to comply.
It's probably just DNS (port 53). It's the way Europeans tend to implement their censorship, with the ISPs as executors. It's trivial to bypass, but most non-technical users don't know how, so it's good enough to comply.