2 entries are registered on port 3483. 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.
Slim Devices Discovery Protocol is used primarily by Logitech Media Server and Squeezebox devices for automatic network device discovery and communication. It facilitates the identification and management of audio devices within a local network environment, simplifying setup and connectivity for home media streaming solutions. This protocol operates primarily over UDP to enable lightweight broadcast queries and responses, crucial for seamless media device integration.
SlimProto is a lightweight streaming protocol developed by Slim Devices, primarily facilitating communication between Logitech Media Server and their Squeezebox family of audio streaming hardware. Designed for simplicity and low latency, SlimProto enables efficient network audio streaming and device management within home audio environments.
The registry says what 3483 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.
linux
ss -ltnp | grep ':3483\b'
macos
lsof -nP -iTCP:3483 -sTCP:LISTEN
windows
netstat -ano | findstr :3483
On 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 3483 — what you actually met is decided by the host, not the registry. If a service is missing here, it belongs in the registry.