IANA-registered to Agilent's Connectivity Service; you meet it on lab instrument workstations, nowhere else.
IANA lists 8766 on TCP and UDP as amcs, the Agilent Connectivity Service. It belongs to Agilent's instrument-control software stack, so it shows up on scientific and manufacturing workstations that talk to lab hardware. Outside that niche the port has no common squatter, and a listener on a general-purpose server is worth identifying by process rather than by the registry name.
Expose with care
Instrument-control services belong on a lab network, not a routable one; there is no reason for this to answer from the internet.
$ sudo lsof -nP -iTCP:8766 -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.