Port 3671
In live entertainment systems, port 3671 is used by KNX.
udp/3671
KNX —
An international standard (ISO/IEC 14543-3) for building automation covering lighting, HVAC, blinds, and access control, which show-control integrators encounter when a venue's architectural/house lighting or building systems must interface with production control.
Check it from the command line
npx showstack port 3671
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If you know something else uses port 3671, tell us. Adding it is one file.