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CDDB Protocol Alternate
Port 8880 is an alternate port traditionally used by the CD DataBase Protocol (CDDBP), which allows music player software to query CD metadata databases such as Gracenote. It typically uses UDP communications, enabling client software to fetch details like album names, artist information, and track listings without direct user input..
The CD DataBase Protocol (CDDBP) was developed to facilitate the automatic retrieval of metadata associated with audio CDs. When a CD is inserted into a compatible player, the client computes a unique hash based on track structure, then queries a remote CDDB server over the network. Using UDP on port 8880 as an alternate to the traditional port 888 for CDDBP, the request is sent and metadata retrieved for a seamless user experience.
The communication is stateless, where the client typically sends a single datagram including the computed hash and expects a structured text response containing metadata. This alternate port offers redundancy or specialized service paths, ensuring metadata availability even during high traffic or specific deployment requirements.
Although CDDB services have mostly migrated towards HTTP-based APIs today, some legacy clients or proprietary systems still rely on UDP-based protocols like CDDBP. These services often maintain UDP interfaces on ports like 8880 for backward compatibility or specialized environments.