Could; you add an id field?

Thanks to your wonderful module, I can export the httpbl table as an CSV file into Excel and easily extract the ip address and create a CSV import into the blocked_ips table with the ip addresses pulled from your module.

However, I want unique, current set, so I know which ips I've already added into the blocked_ips table, and a counter would show this.

Better yet, maybe add this functionality into your module on the module config page?