RTMP — the Flash-era live streaming protocol that is still how most video gets pushed into a streaming platform.
IANA registered 1935 to Macromedia for Flash Communication Server MX, and it is the default port in Adobe's RTMP 1.0 specification (rtmp://host:1935/app). Flash is gone but RTMP ingest is not: OBS, ffmpeg, and hardware encoders publish to YouTube, Twitch, and self-hosted nginx-rtmp or SRS servers on this port, which then transcode to HLS or DASH for playback. A listener on 1935 is almost always a live-video ingest endpoint or a restreamer.
Expose with care
Plain RTMP is unencrypted and the stream key travels in the clear, so anyone on the path can capture it and publish as you — expose ingest only over RTMPS, and restrict who may publish.
$ nc -vz TARGET 1935Seen this on your network? Beige Box scans your Wi-Fi and shows every open port on every device — and its Ports tool links straight back here.
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Corrections or a missing port? Reply @rimrocksystems.