2 entries are registered on port 2483. 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.
Port 2483 is utilized by Oracle databases as the designated unencrypted listener port, replacing the default port 1521 in some configurations. This port facilitates communication between Oracle clients and the database server when SSL or other encryption mechanisms are not enforced. It enables initial connection establishment and orchestration of SQL query execution over TCP or UDP protocols without transport-level security.
The registry says what 2483 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 ':2483\b'
macos
lsof -nP -iTCP:2483 -sTCP:LISTEN
windows
netstat -ano | findstr :2483
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 2483 — what you actually met is decided by the host, not the registry. If a service is missing here, it belongs in the registry.