Bridges are distributed via five mechanisms : HTTPS, Email, Telegram, Settings and Reserved. Bridge operators can check which mechanism their bridge is using, on the Relay Search. Enter the bridge's <HASHED FINGERPRINT> in the form and click "Search".

Operators can also choose which distribution method their bridge uses. To change the method, modify the BridgeDistribution setting in the torrc file to one of these: https, email, telegram, settings, none, any. You can find a description of each distributor in the Bridge distribution documentation.

Read more on the Bridges post-install guide.