https://blog.cryptoaustralia.org.au/2017/12/23/best-threat-blocking-dns-providers/
A handful of alternative DNS services offer protection from malware, ransomware and phishing. Providers like OpenDNS and Quad9 can blackhole DNS requests for blocking network traffic associated with botnets, phishing and exploits. These DNS providers promise some level of threat protection, but what do they know? Do they know things? Let's find out!