This is a dark art, and many of the sources are shady as fuck! We often have no idea of their methodology. Also no source is fully complete. We just piece up as best we can.
In order to explore IPs in known IP ranges, what we need are good DNS databases.
- www.zone-h.org/archive/ip=208.76.80.93/page=11?hz=1 mentions
newsupdatesite.com
and mentions "defacement", the "Mass Deface III" pastebin comes to mind. No other nearby hits on quick inspection.