Registered for DMIDI, a distributed MIDI transport; almost never seen on real networks.
IANA assigns 1199 on TCP and UDP to the service name dmidi ("DMIDI"), registered by Phil Kerr for carrying MIDI messages between machines over IP. It is not one of the transports that current music software defaults to — RTP-MIDI and vendor-specific protocols carry that traffic instead. In practice you will not meet 1199 on a scan of ordinary infrastructure, and a listener there is more likely some unrelated application that picked a free port than a DMIDI implementation.
Expose with care
Treat an open 1199 as an unidentified local application until you have confirmed the owning process; the registration name is not evidence of what is running.
$ sudo lsof -nP -iTCP:1199 -sTCP:LISTENSeen 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.