SCO System Administration Server — the admin service of a SCO Unix box, and those are museum pieces.
IANA registers TCP and UDP 616 as "sco-sysmgr", the SCO System Administration Server, from the SCO OpenServer and UnixWare line. It is one of a small cluster of SCO administrative ports registered in the same range, alongside sco-dtmgr on 617. SCO Unix has had no meaningful presence for two decades, so a listener here is either genuinely ancient industrial or point-of-sale hardware, or unrelated software that happened to pick 616.
Do not expose
A system administration plane on an operating system that stopped receiving security fixes long ago. If this is real SCO, it should be behind a firewall and on a plan to be retired.
$ nc -vz -w 3 TARGET 616Seen 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.