The Big Brother monitoring port, still in service as Xymon's server port.
IANA registers 1984 as bb, for the Big Brother monitoring system. Big Brother itself is long dead, but its successor Xymon kept the port: xymond listens on 0.0.0.0:1984 by default and accepts status reports from client machines as well as query and control commands. If you find it open, you are looking at a monitoring server, and its clients are pushing to it from across the network.
Do not expose
The Xymon protocol has no authentication — anyone who can reach the port can inject false status, read the monitoring database, and issue control commands, so keep it inside the monitored network.
$ printf 'ping\n' | nc -w 3 TARGET 1984Seen 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.