Blocked-IP is a service based on a daily updated IP blacklist. The blacklist is free for download. >> http://api.anyfree.org/blockip/ <<
After running the service for a couple of weeks now, we already identified more than 13.000 violent IP addresses. The list is actually growing with 50 to 100 new addresses per day.
For sure this tool doesn’t solve all vulnerability of your WP – implementation. But to exclude the most vulnerable well-known IP addresses from accessing you website might be a first big step.
Blocked-IP is now in beta state. If you like to support a fast progress in implementing more features and a code – solution out of the box you could contribute here.