FileMaker Server's local-only Admin Console URL: http://localhost:16001/admin-console.
IANA registers 16001 as fmsascon, "Administration Server Connector", to FileMaker. Claris documents it as the way to open the Admin Console on the primary machine itself — http://localhost:16001/admin-console — and states plainly that port 16001 is only available on the local host, not from a remote machine. Remote administrators use the HTTPS console on the server's normal web port instead.
Do not expose
Documented as loopback-only. If 16001 answers from another host, either the binding was changed or something other than FileMaker Server is listening.
$ curl -sI --max-time 5 http://localhost:16001/admin-consoleSeen 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.