Unregistered; scanners see it occasionally but with no consistent service behind it.
There is no IANA registration for 9415, and nmap's services file records it as unknown, appearing slightly more often than its neighbours but without a name attached. That pattern is typical of a port picked by one or two products rather than by a standard. Only a version scan of the specific host will tell you what it is.
Expose with care
Identify the listener before exposing or trusting it; an unnamed port is an unaudited one.
$ nmap -sV -Pn -p 9415 TARGETSeen 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.