2 entries are registered on port 3030. 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.
NetPanzer is a real-time online multiplayer tactical tank combat game, which allows players to connect over the internet or a local area network to battle in strategic warfare scenarios. It leverages port 3030 for in-game communication, facilitating both control commands and real-time gameplay updates among participants.
The registry says what 3030 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 ':3030\b'
macos
lsof -nP -iTCP:3030 -sTCP:LISTEN
windows
netstat -ano | findstr :3030
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 3030 — what you actually met is decided by the host, not the registry. If a service is missing here, it belongs in the registry.