Registered as ismserver, a private assignment with no public specification.
IANA lists 9500 for both TCP and UDP as ismserver, an individual registration with no published protocol description, and nmap carries the same bare name. There is no open specification to read and no widely deployed open-source daemon that defaults here, so the registration tells you little. Being a round number just below the ephemeral range, 9500 is also a popular arbitrary choice for internal application listeners.
Expose with care
Without a known protocol there is no reason to trust it; identify the process and apply that service's rules.
$ nmap -sV -Pn -p 9500 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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