Registered as ospf-lite; in practice a round number people grab for their own services.
IANA registers 8899 on TCP and UDP as ospf-lite. Real OSPF is not a TCP service at all — it runs directly over IP protocol 89 — so this registration is for a specific product's lightweight variant rather than the routing protocol you know. Nothing widespread listens here, which leaves 8899 as another memorable HTTP-alt number that applications and proxies choose for themselves.
Expose with care
Identify the owning process first; the registry name tells you nothing useful about what is answering.
$ sudo lsof -nP -iTCP:8899 -sTCP:LISTENSeen 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.