Reserved at IANA with no owner since the 2013 cleanup; any listener here is non-standard.
IANA lists 1031 as "Reserved", with no service name, no assignee, and the same 2013-05-24 removal note as 1030 and 1032. There is no protocol to describe. On scans it turns up as another dynamically allocated endpoint on legacy Windows systems, which used 1025-5000 for RPC and DCOM before Vista moved that range to 49152-65535.
Expose with care
Nothing is registered here; identify the process behind it rather than inferring anything from the port number.
$ nc -vz TARGET 1031Seen 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.