UDP 6881
Synopsis
- UDP port 6881 is most commonly used by the BitTorrent protocol for Mainline DHT and µTP (uTP) traffic.
- Popular BitTorrent clients—µTorrent, BitTorrent (official client), Vuze/Azureus, qBittorrent, and Deluge—often listen on UDP 6881 for DHT/µTP when configured to use that port (many guides and deployments use 6881 even if the client’s default is random).
- Transmission can likewise use UDP 6881 for DHT/µTP if its listening port is set to 6881.
- Because DHT and µTP are UDP-based, services on UDP 6881 have been abused for reflection/amplification DDoS attacks when exposed by BitTorrent clients.
Observed activity
Last 30 days
Detailed chart