Port 30020
In live entertainment systems, port 30020 is used by MA-Net.
udp/30020
MA-Net — MA-Net3 general session communication (session 1)
MA Lighting's proprietary session and device-networking protocol linking grandMA2/grandMA3 consoles, onPC stations, NPUs and MA nodes over UDP multicast (plus TCP for large transfers). It is what actually carries console session data, backup/redundancy state and DMX output between everything on the MA network switch, not a separately branded product.
Check it from the command line
npx showstack port 30020
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If you know something else uses port 30020, tell us. Adding it is one file.