3 entries are registered on port 6901. It is a registered port (1024–49151) — IANA records an assignee, but nothing stops other software from listening here, which is why the number carries more than one entry.
services registered on this number
2 transports in use
entries encrypted on the wire
1 of 3 iana-registered
| port | service | proto | category | risk | views |
|---|---|---|---|---|---|
| :6901 | BitTorrent | TCPUDP | File Transfer | caution | 10.2k |
| :6901 | Windows Live Messenger Voice | TCPUDP | Streaming | caution | 6.0k |
| :6901 | Novell Jetstream | TCP | Network Services | safe | 0 |
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.
port 6901 as BitTorrent →Port 6901 was commonly used by Windows Live Messenger for its voice chat functionality, enabling users to engage in real-time audio conversations alongside instant messaging. This port facilitated media streaming required for voice communication, relying on both TCP and UDP protocols for establishing connections and managing data transfer. Although the service is largely obsolete today, the port still highlights legacy voice-over-IP communication support within consumer instant messaging clients.
port 6901 as Windows Live Messenger Voice →TCP port 6901 is assigned to the Novell Jetstream messaging protocol.
port 6901 as Novell Jetstream →The registry says what 6901 is registered to. What is listening on it right now is decided by the host, and only the host can be asked. Each of these prints the process behind the socket.
ss -ltnp | grep ':6901\b'lsof -nP -iTCP:6901 -sTCP:LISTENnetstat -ano | findstr :6901On Linux and Windows the process name comes back with the socket; on macOS lsof needs sudo to name a process that isn't yours. Match what it prints against the 3 entries above.
A port number is not a service. Anything may listen on 6901 — what you actually met is decided by the host, not the registry. If a service is missing here, it belongs in the registry.
contribute an entry