Registered to HP's virtual machine manager control channel — an HP-UX-era management port.
IANA lists 1124 as hpvmmcontrol, "HP VMM Control", the control channel for HP's virtual machine manager on Integrity/HP-UX systems. It is a hypervisor management interface, not a workload port, so it belongs to a shrinking population of legacy HP servers. Nmap's data confirms it is rarely found open.
Do not expose
A hypervisor control channel gives control over every guest on the host; it belongs on an isolated management network, never a public interface.
$ sudo lsof -nP -iTCP:1124 -sTCP:LISTENSeen 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.