Port 34963
In live entertainment systems, port 34963 is used by PROFINET.
udp/34963
PROFINET — PROFINET RT multicast (registered, rarely used in practice)
PI's real-time industrial Ethernet standard for connecting PLCs, drives and I/O, spanning acyclic RPC parameter access over UDP/TCP up to sub-millisecond isochronous real-time (IRT) cyclic I/O carried as raw Ethernet frames. In entertainment it shows up where show control hands off to venue or stage-machinery automation, such as fixed-theatre stage-technology installs.
Check it from the command line
npx showstack port 34963
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If you know something else uses port 34963, tell us. Adding it is one file.