Registered in 2002 by Sun as smc-http — the cleartext sibling of the management console on 6789.
IANA lists 6788/tcp and 6788/udp as smc-http, registered in November 2002 by a Sun Microsystems engineer. It is the HTTP half of the pair whose HTTPS half sits on 6789, the port Oracle's Solaris administration console still uses. There is no public protocol document for the registration itself, so on a modern network an open 6788 is either legacy Sun-derived management tooling or unrelated software using a free port.
Do not expose
A management console reached over plain HTTP hands its session and credentials to anyone on the path. If the tooling still exists, use its TLS listener and firewall this one off.
$ curl -sI http://TARGET:6788/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.
Get Beige Box →also available as JSON · Markdown
Corrections or a missing port? Reply @rimrocksystems.