Registered to WHEREHOO, a location-service project from the early 2000s that no longer exists in the wild.
IANA assigns 5859 to wherehoo, "WHEREHOO", registered by Jim Youll for a location-oriented service of that name. The project is long defunct and there is no deployed base to speak of, so the registration is history rather than a description of what runs there. An open 5859 today is some other application that took an unclaimed-looking number.
Expose with care
The registered service is dead, so anything listening is unidentified. Find the process rather than trusting the registry name.
$ sudo lsof -nP -iTCP:5859 -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.