Port 80
In live entertainment systems, port 80 is used by AMWA NMOS.
tcp/80
AMWA NMOS — IS-04/IS-05 HTTP APIs on the device (port is deployment-dependent)
The discovery and connection layer that makes SMPTE ST 2110 usable. IS-04 lets devices register and be found; IS-05 does the actual connection management, telling a receiver which sender to listen to. Without it, a 2110 plant is hand-edited SDP files.
Check it from the command line
npx showstack port 80
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If you know something else uses port 80, tell us. Adding it is one file.