Unregistered and undocumented; a scan hit here identifies nothing on its own.
IANA has no entry for 57797 because RFC 6335 excludes the Dynamic/Private range from assignment. Nmap's nmap-services lists it "unknown" at 0.000228, one of the lowest frequencies still inside the default top-1000 TCP set. The SANS ISC port page has an empty service field. For an obscure port this is the whole truth: registered to nobody, rarely seen, never identified.
Expose with care
Identify the binding process before making any exposure decision; the port number carries no information.
$ sudo lsof -nP -iTCP:57797 -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.