Unassigned at IANA with no documented service — the number tells you nothing.
IANA has no registration for 9914, and Nmap's service data lists it as unknown at low frequency. No standard protocol, product default, or well-documented malware claims it. If it is open, some locally installed application bound it; the process table is the only reliable source of truth.
Expose with care
No known service, so no defensible verdict from the number alone. Identify the listener first.
$ sudo lsof -nP -iTCP:9914 -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.