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BitTorrent
Port 6901 is commonly associated with BitTorrent peer-to-peer (P2P) file sharing traffic. It typically falls within the dynamic range of ports used by BitTorrent clients during data exchange, enabling users to download and upload large files efficiently across distributed networks. As an unofficial port, it’s utilized variably by different clients when establishing multiple connections for torrent swarms..
BitTorrent protocol is a widely adopted P2P method for distributing files over the internet without relying solely on a central server. Clients break down large files into many small pieces ('chunks') and share them simultaneously with numerous peers. During download, pieces are fetched from multiple sources in parallel, optimizing bandwidth and speed.
Port 6901 is one of many ports that BitTorrent clients may listen on or use to initiate outgoing connections. Since BitTorrent can employ a wide range of dynamic or configurable ports, 6901 is often seen in default or randomized setups but isn't formally assigned to BitTorrent by IANA. It can be used over TCP and UDP, where TCP handles most transfers and UDP supports extensions like uTP (Micro Transport Protocol) for efficient congestion management.
Besides file transfers, UDP over such ports may support Distributed Hash Table (DHT) operations or peer discovery processes. The flexible, decentralized design of BitTorrent enhances scalability but also complicates tracking and filtering based on port numbers alone.