For the last few months, my wikia has fallen victim to large numbers of vandals, writing NSFW content on the pages. I get the feeling that it's only a few users, but they're using many different IP addresses, making it impossible to block them. I tried protecting the most targeted pages, but the vandals just keep moving on to other pages.
I want to know if I can protect my wikia from unregistered users entirely. The logged-in users are doing just fine, but the vandalism is becoming a real pain.