Port 8883
In live entertainment systems, port 8883 is used by MQTT.
tcp/8883
MQTT — MQTT over TLS
Publish and subscribe messaging designed for unreliable links and small devices. Nothing talks to anything directly: publishers send to a topic on a broker and subscribers ask the broker for topics they care about, which decouples every device from every other. The default plumbing of connected-device work, and increasingly of show integration glue.
Check it from the command line
npx showstack port 8883
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If you know something else uses port 8883, tell us. Adding it is one file.