2 entries are registered on port 4747. 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 |
|---|---|---|---|---|---|
| :4747 | Apprentice | TCP | Remote Access | caution | 11.6k |
| :4747 | Buschtrommel | UDP | File Transfer | safe | 0 |
Port 4747 is used primarily by the VNC-based remote desktop tool TightVNC’s 'Apprentice' component to facilitate remote access and control of computer systems. It enables remote management, troubleshooting, and screen sharing, making it effective for system administration and remote support. Although not widely standardized, it is popular in certain remote support and monitoring solutions.
port 4747 as Apprentice →Buschtrommel is assigned to UDP peer-to-peer file exchange.
port 4747 as Buschtrommel →The registry says what 4747 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 ':4747\b'lsof -nP -iTCP:4747 -sTCP:LISTENnetstat -ano | findstr :4747On 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 4747 — 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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