Port 9875
In live entertainment systems, port 9875 is used by AES67.
udp/9875
AES67 — SAP session announcements used for AES67 stream discovery
An AES interoperability standard for streaming uncompressed audio over IP using RTP and IEEE 1588 PTP. It is the common ground that lets Dante, RAVENNA, Q-LAN, Livewire and Ravenna-derived broadcast gear exchange streams without a hardware bridge.
Check it from the command line
npx showstack port 9875
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