Port 4440
In live entertainment systems, port 4440 is used by Dante.
udp/4440
Dante — Dante audio control
Audinate's proprietary audio-over-IP system carrying uncompressed multichannel audio, clocking and device control over ordinary gigabit ethernet. It is the default audio network on most touring and install jobs, and usually what a desk, a stagebox and an amp rack are talking to each other with.
Check it from the command line
npx showstack port 4440
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If you know something else uses port 4440, tell us. Adding it is one file.