Unassigned at IANA — no registered service, and nothing standard listens here.
The registry lists 5438-5442 as unassigned, so 5440 has no service name and no owner. Its neighbours are busy — 5432 is PostgreSQL, 5443 is registered to Pearson — but the port itself is claimed only by whatever application an operator points at it. Identify the process rather than reading anything into the number.
Expose with care
No registration means no assumptions: an open 5440 is an application someone chose, and it should be reviewed on its own terms.
$ sudo lsof -nP -iTCP:5440 -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.