Best Public DNS Servers 2025: Speed, Privacy & Security

Changing your DNS can speed up lookups, improve privacy, and optionally block malware or adult content. Pick one provider and set both the Primary and Secondary addresses on your device or router. Don’t mix providers.

Quick Comparison Table

How to Change DNS (Short Version)

1. Open your device or router network settings.
2. Find the DNS fields and enter the Primary and Secondary IPs from one provider above.
3. Save & restart your connection. Test by visiting dns leak test or the provider’s test page.

What Is a DNS Server?

The Domain Name System (DNS) translates human-friendly names like example.com into IP addresses that computers use to connect. A DNS resolver (the “DNS server” you configure) answers those lookups and returns the correct address, ideally as quickly and privately as possible.

How It Works (Short Version)

• Your device asks your configured DNS resolver for the IP of a domain.
• The resolver either serves a cached answer or queries authoritative name servers.
• Responses are cached for a set time (the TTL) to speed up future lookups.

Why Change Your DNS?

• Speed: Some resolvers have faster global networks and smarter caching.
• Reliability: Anycast routing and large footprints reduce outages.
• Security: Options like malware blocking and phishing protection (e.g., Quad9, CleanBrowsing).
• Privacy: Certain providers minimize logs and support encrypted transport.
• Content Controls: “Family” profiles block adult content or enforce SafeSearch.

Privacy & Encryption

Traditional DNS is unencrypted. Many resolvers now support:

• DNS over HTTPS (DoH) & DNS over TLS (DoT): Encrypt DNS traffic between you and the resolver.
• Minimal/anonymous logging: Some providers commit to reduced retention. Check each provider’s policy.

IPv4 vs. IPv6

Most lists show IPv4 addresses (e.g., 1.1.1.1). Many providers also offer IPv6 (e.g., 2606:4700:4700::1111). If your network uses IPv6, add those too.

Best Practices

• Configure both Primary and Secondary from the same provider.
• Set DNS on your router to cover your whole network; override per device if needed.
• After switching, flush DNS cache on your device/router for immediate effect.
• Test with a DNS leak/check tool and a few sites you often visit.

When Not to Change

• Corporate or school networks that rely on internal DNS (“split DNS”).
• ISP features tied to their DNS (e.g., IPTV or captive portals) unless you know the impact.

Troubleshooting Tips

• If some sites don’t resolve, revert temporarily to your old DNS to compare.
• Check for typos and ensure the Secondary address is reachable.
• Restart your router and device after changes; clear browser DNS/host resolver cache.