Registered as dproxy, with no assignee and no protocol specification on record.
IANA lists 1296 on TCP and UDP under the service name dproxy, described only as "dproxy", with no assignee. The name collides with several unrelated proxy projects, so it does not pin down any particular software, and no specification is published for the registered use. Nothing notable is documented as habitually listening on 1296.
Expose with care
Any proxy reachable from untrusted networks risks being used as an open relay; identify the process and confirm it is not forwarding for strangers.
$ sudo lsof -nP -iTCP:1296 -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.