RTSP — almost always an IP camera, NVR, or streaming appliance offering a video feed.
RTSP is the control protocol for streaming media: a client sends OPTIONS/DESCRIBE/SETUP/PLAY over TCP 554 and the actual audio and video flow over RTP, either on separate UDP ports or interleaved back over the same TCP connection. In practice every hit on 554 is an IP camera, a DVR/NVR, or a video encoder, since that is the ecosystem that standardized on it (ONVIF profiles included). Clients like VLC and ffmpeg speak it directly with an rtsp:// URL.
Do not expose
RTSP authentication is Basic or Digest over an unencrypted channel and vendor firmware routinely ships default credentials, which is why internet-facing 554 is the single largest source of publicly viewable private cameras.
$ printf 'OPTIONS rtsp://TARGET:554/ RTSP/1.0\r\nCSeq: 1\r\n\r\n' | nc -w 3 TARGET 554Seen 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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