Registered to the Snarl notification protocol, but in practice just another spare HTTP port.
IANA assigns 8084/tcp to websnp, "Snarl Network Protocol over HTTP" — the network transport for the Snarl desktop notification system, which is long since discontinued. What you actually meet on 8084 is the fourth or fifth HTTP listener on a busy host: a second app instance, a metrics endpoint, or a container that took the next free port after 8080 through 8083. The port tells you nothing about the protocol, so identify the listener rather than trusting the registration.
Expose with care
Whatever is here is an unlabelled HTTP service someone chose by counting upward; check what it serves and whether it authenticates before letting it out of the host.
$ curl -sI --max-time 5 http://TARGET:8084/Seen 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.