No registration, no known default service — an open 16016 identifies nothing on its own.
16016 is unassigned at IANA and unnamed in Nmap's services file, yet it sits inside Nmap's default top-1000 TCP ports because real-world scans see it open often enough to be worth a probe. No widely deployed product documents it as a default. A listener here is almost always an application or container that picked a memorable number.
Expose with care
Judge it by what answers, not by the number. Run a version probe; an unknown service on a public interface deserves the same suspicion as any unexplained daemon.
$ nmap -Pn -sV -p 16016 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.