2 entries are registered on port 888. It is a well-known port (0–1023) — assignments here are IANA's, and a service found on one is usually the service that was assigned it.
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 |
|---|---|---|---|---|---|
| :888 | CDDBP | TCP | Media | safe | 9.8k |
| :888 | AccessBuilder | TCPUDP | — | safe | 0 |
Port 888 is commonly associated with the CD Database Protocol (CDDBP), a service utilized by media player applications to identify compact discs by querying an online database. Although not officially assigned, CDDBP over this port has seen widespread, unofficial adoption, facilitating the retrieval of metadata such as album titles, artist names, and track listings, enhancing the user experience during CD playback.
port 888 as CDDBP →IANA assigns TCP and UDP port 888 to the AccessBuilder service.
port 888 as AccessBuilder →The registry says what 888 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 ':888\b'lsof -nP -iTCP:888 -sTCP:LISTENnetstat -ano | findstr :888On 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 888 — 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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