Unassigned by IANA — an overflow HTTP port and nothing more standardised than that.
IANA lists 8011-8014 as Unassigned, and Nmap has no service name for 8011 either. Its only real characteristic is its neighbourhood: it sits in the 8000-8100 band that people work through when they need one more HTTP listener, so a hit is most often an application's Nth web port rather than a defined protocol. Fingerprint it; the number carries no meaning.
Expose with care
Unassigned means no protocol-level judgement is possible. If it answers HTTP, treat it like any other unproxied app port and check whether it expected to be private.
$ curl -sI http://TARGET:8011/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.