2 entries are registered on port 6543. 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 2 iana-registered
| port | service | proto | category | risk | views |
|---|---|---|---|---|---|
| :6543 | Jetnet | UDP | Network Services | caution | 65.3k |
| :6543 | MythTV Backend | TCPUDP | Streaming | risk | 0 |
Paradigm Research & Development Jetnet utilizes port 6543 primarily for communication between its networked devices and systems. This port facilitates device management, telemetry, and control functions within Jetnet deployments, leveraging the UDP protocol for lightweight, efficient message exchange. Although unofficial, it remains important in industrial and research environments where Paradigm's products are utilized.
port 6543 as Jetnet →TCP 6543 is commonly the MythTV backend control and media service, used by MythTV frontends to connect to a DVR backend.
port 6543 as MythTV Backend →The registry says what 6543 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 ':6543\b'lsof -nP -iTCP:6543 -sTCP:LISTENnetstat -ano | findstr :6543On 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 2 entries above.
A port number is not a service. Anything may listen on 6543 — what you actually met is decided by the host, not the registry. If a service is missing here, it belongs in the registry.
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