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Quad9: 9.9.9.9 & 149.112.112.112 Quad9 website

Quad9 has free public DNS servers that protect your computer and other devices from cyber threats by immediately and automatically blocking access to unsafe websites. One thing I appreciated while researching this company is that it works without storing your personal data; their website clearly states that when you use Quad9, „no data containing your IP address is ever logged.“

  Primary DNS: 9.9.9.9
  Secondary DNS: 149.112.112.112

There are also Quad 9 IPv6 DNS servers:

  Primary DNS: 2620:fe::fe
  Secondary DNS: 2620:fe::9

Quad9 doesn't filter content—only domains that are phishing or contain malware will be blocked. There's also has an unsecured IPv4 public DNS (i.e., no malware blocking) at 9.9.9.10 (2620:fe::10 for IPv6). Quad9 also supports DoH.

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