The HP printer status channel — usually open on the workstation, not the printer.
IANA registers 5226 to Hewlett-Packard as hp-status on TCP and UDP. It is the better-known half of the 5225/5226 pair: the HP Universal Print Driver listens on it so printer status can be delivered back to a workstation. Because it opens on ordinary desktops as a side effect of installing a printer driver, it is a frequent source of internal port-scan alerts that turn out to be benign.
Expose with care
There is no reason for a desktop print-status listener to be reachable from anywhere but the local network.
$ nc -vz -w 3 TARGET 5226Seen 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.