A rare thing in the port registry — an assignment that was taken back. 1783 is officially nobody's.
IANA's registry carries no service name for 1783. The entry reads only "Decomissioned Port 04/14/00" (IANA's spelling), meaning the original assignment was withdrawn in April 2000 and never reissued to anyone. There is no protocol to describe. Anything listening here is a locally chosen port, and no scanner's service guess for 1783 is based on a registration.
Expose with care
With no assignment at all, the port name tells you nothing — find the listening process on the host and judge that software, not the number.
$ nc -vz -w 3 TARGET 1783Seen 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.