So I've discovered recently that instead the moderators and admins doing their due diligence, they'll just ban your IP. I can't wait for this to blow up in their face.
How would mods get access to that data? I don't see why Reddit would give away such metrics to volunteers.
What is probably happening is that Reddit is maintaining the database of problematic accounts and letting mods choose which accounts are problematic. From the list of problematic accounts, Reddit could probably pull together a list of problematic IP addresses, especially if the problem is across multiple subs.