I think you are correct that 5.X is a requirement for PAN-DB. I've mostly used BrightCloud on 4.X, and I've posed the same question. The answers I get back are that PAN-DB is informed from multiple open source lists, and is also fed by wildfire results. What I would be interested to know is if PAN-DB also categorizes IP addresses. From what I can tell, BrightCloud URL-Filtering will not block access to websites based on their IP address (if someone could confirm this, it would be greatly appreciated!).
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