Unassigned — part of IANA's empty 7914-7931 block above QuickObjects.
IANA lists 7914 through 7931 as unassigned, so 7920 has no registered service, and Nmap carries no name for it either, at roughly 0.02% open-port frequency on TCP. There is no protocol to expect. Whatever answers was configured locally or picked automatically by an application looking for a free high port.
Expose with care
Unknown service: identify the listening process, then decide. An unregistered port is a common hiding place for debug and management interfaces.
$ nmap -Pn -sV -p 7920 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.