Named "interbase" in the registry, but the InterBase/Firebird database actually lives on 3050.
IANA lists the service name interbase on TCP and UDP 2041 with no description, assignee or reference. The database engine the name suggests does not use it: Borland InterBase and its open-source descendant Firebird use the registered gds-db service on port 3050, which is what their servers bind by default. So 2041 is a historical name with no protocol documented and no common software behind it — Nmap sees it open on about 0.02% of hosts.
Expose with care
Do not assume a database. A listener here is unidentified; if you are actually looking for InterBase or Firebird, check 3050 instead.
$ sudo lsof -nP -iTCP:2041 -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.