Easiest way: check the log to see what was blocked. It's as simple as that. Happens so infrequently though - the lists are made up of domains you don't typical

Easiest way: check the log to see what was blocked. It's as simple as that. Happens so infrequently though - the lists are made up of domains you don't typically want to whitelist. Only 133,608 on my lists though, and that's pretty up to date.