Unregistered and unnamed — Nmap scans it on frequency data alone.
There is no IANA assignment for 16012 and no service name in Nmap's database; it earns its place in Nmap's default top-1000 TCP list only because scans find it open with measurable frequency. The neighbouring 16020 and 16021 are registered to FileMaker's Java Web Publishing Core, but nothing extends that block down to 16012. Treat an open 16012 as an unidentified application port.
Expose with care
Nothing is known about what is behind it, which is exactly the problem: identify the listener before leaving it reachable from anywhere untrusted.
$ nmap -Pn -sV -p 16012 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.