By default Tor doesn't make any attempt to disguise the fact it's Tor traffic. Bridges are unlisted relays, which should work for IP blocking, while Plugable Tr

By default Tor doesn't make any attempt to disguise the fact it's Tor traffic. Bridges are unlisted relays, which should work for IP blocking, while Plugable Transports are made to evade censorship-focused traffic analysis (i.e., they will prevent the adversary from detecting and blocking Tor connections as a whole, but not prevent a dedicated adversary from figuring out "has this client been using Tor?").