The registered admin port of Sun's web server line — an administration plane, whatever ends up using it.
IANA registers 8800 as sunwebadmin, the Sun Web Server administration service, later carried into Oracle iPlanet Web Server. That product line is end-of-life, so the registration mostly survives as a label. In practice the number gets reused as a round HTTP-alt port by appliances and self-hosted software, so confirm what is listening instead of trusting the registry name.
Do not expose
As registered it is a server administration console; admin planes do not belong on a public interface regardless of which vendor's console it turns out to be.
$ curl -skI https://TARGET:8800/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.