Dns | 3.3.3.3
While the IP is unencrypted legacy DNS (port 53), Quad9 supports encrypted protocols on the same IP:
When you request a website, Quad9 cross-references that domain against over 90 different threat intelligence sources (including IBM X-Force, Proofpoint, and Abuse.ch). If the domain is known to host malware, ransomware, or a phishing kit, Quad9 returns a NXDOMAIN (non-existent domain) error instead of the IP address. dns 3.3.3.3
Using an unverified IP address (like 3.3.3.3 or others) can result in: While the IP is unencrypted legacy DNS (port