Named dls in the registry, with no description — and not the Directory Location Service, which is port 197.
IANA lists dls on TCP and UDP 2047 with no description, assignee or reference. The same three letters are also registered at port 197 where they do mean something — Directory Location Service — so the 2047 entry is a name collision rather than the same protocol on a second port. It pairs with dls-monitor on 2048, and neither has published documentation; Nmap sees 2047 open on about 0.02% of hosts.
Expose with care
No documented protocol and a misleading name. Identify the listening process rather than inferring a service from the label.
$ sudo lsof -nP -iTCP:2047 -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.