For the first time, i set Norton DNS and they're the best. MUCH BETTER than OpenDNS. OpenDNS are not so good, not block infact almost all tumblr porn sites. Go here: Norton ConnectSafe https://dns.norton.com/index.html Then "Get Started" configure router or pc and choose "C - Security + Pornography + Other". It will block ALL! It's fantastic! Finally i found a dns that's really strong!