Maybe at some point there were crawlers that assigned spam reputation on a per-IP basis, but so much of the internet these days goes through Cloudflare and other CDNs with shared IP ranges that it would be insane to keep this practice up.
Maybe 2-3 years ago. Pretty sure it was IP based. CF drops you on a shared IP, its hit and miss of you end up on an IP next to a bunch of dodgy sites or not, do a reverse IP lookup to find out what else is running on your IP.
> It would be insane to keep this practice up.
What's the alternative?
Oh yea, did CF ever fix the domain hijacking issue for deleted sites?
