Unassigned at IANA and effectively unseen in the wild — no standard service lives here.
The IANA registry has no entry for 9575 on TCP or UDP, and Nmap's service database records it as unknown with one of the lowest observed frequencies in the 9000s. There is no documented protocol, product default, or malware association worth repeating. If something is listening, it is a local application that picked a free high port; identify it by process rather than by number.
Expose with care
Nothing here is known-safe or known-bad. Determine the owning process before exposing it anywhere.
$ sudo lsof -nP -iTCP:9575 -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.