Port 1883
In live entertainment systems, port 1883 is used by MQTT.
tcp/1883
MQTT — MQTT, unencrypted
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 1883
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If you know something else uses port 1883, tell us. Adding it is one file.