Registered under the bare name "device" with no description and no known implementation.
The IANA registry entry for 801 is the service name "device" with an empty description and no recorded contact or reference. No specification was ever published, and there is no software known to implement it. Nmap lists the same name purely because it mirrors the registry. Anything answering on 801 is a locally chosen listener that has nothing to do with the registration.
Expose with care
The name tells you nothing; fingerprint the listener and judge its exposure on what it actually is.
$ nmap -sV -p 801 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.