2 entries are registered on port 4664. 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 4664 is primarily associated with Google Desktop Search, an application developed by Google to index and enable quick search functionality over a user's local files and emails. This port facilitates communication and management of search queries between the user interface and the local indexing service. Though Google Desktop was discontinued, references to this port can still be found in legacy environments or within archived software setups.
The registry says what 4664 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 ':4664\b'
macos
lsof -nP -iTCP:4664 -sTCP:LISTEN
windows
netstat -ano | findstr :4664
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 4664 — what you actually met is decided by the host, not the registry. If a service is missing here, it belongs in the registry.