Port 20808
In live entertainment systems, port 20808 is used by Ableton Link.
udp/20808
Ableton Link — Link discovery and session state messages
Ableton's peer-to-peer protocol for sharing tempo, beat and phase between music applications on a local network. There is no master and no clock owner: any peer can change the tempo and everyone else follows within a beat.
Check it from the command line
npx showstack port 20808
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