I think that government censorshop is bad for free speech. If you have two dns services one normal and one with blacklisted ip, then you can loop over the doma

I think that government censorshop is bad for free speech. If you have two dns services one normal and one with blacklisted ip, then you can loop over the domain names in both dns services compare the result and find the blacklist. Easier for reverse dns loopups, but not impossible if you have a list of forward dns names.