Registered to the ESL License Manager — an EDA-era floating-licence daemon.
Port 1455 is registered on TCP and UDP as esl-lm, "ESL License Manager", assigned to Abel Chou. Like most of the 1400–1500 range it comes from the era when every EDA and CAD vendor registered a port for its floating-licence daemon. There is no current public specification, and the product is not something you meet on general-purpose infrastructure; on a scan of an engineering workstation network it would be a licence server, anywhere else it is an unidentified listener.
Expose with care
Licence daemons are internal infrastructure and are typically old, unauthenticated C daemons — keep them on the engineering network, not the internet.
$ sudo lsof -nP -iTCP:1455 -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.