Registered to an Integrated Engineering Software license manager; mostly a typo magnet for 443 and 1433.
IANA assigns 1443 on TCP and UDP to ies-lm, "Integrated Engineering Software", a licence manager for that vendor's simulation products. The port's real notoriety is being one digit away from both 443 and 1433, so it shows up constantly in mistyped firewall rules and connection strings. There is no widely deployed protocol here; an open 1443 is either that vendor's licence daemon or an application someone deliberately parked next to 443.
Expose with care
Nothing on 1443 is inherently safe or unsafe — identify the actual listener, and check it is not an admin interface someone assumed was obscure.
$ sudo lsof -nP -iTCP:1443 -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.