A 2005 vendor registration for a login server; effectively absent from real scans.
IANA registers 1151 as unizensus, "Unizensus Login Server", assigned in November 2005. No protocol specification is published and Nmap's frequency data shows it open on a tiny share of hosts. Treat an open 1151 as an unidentified application rather than as this product.
Expose with care
The registration is an authentication endpoint with unknown transport security — confirm what is listening and whether credentials cross the wire in the clear.
$ sudo lsof -nP -iTCP:1151 -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.