Top 5 best free DNS Servers - August 2021

Replacing your default DNS Server pre-configured by your ISP is the good way for:

• Access websites are blocked in your country.

• Lower latency in querying DNS Record.

• Block some ads by third-party DNS.

In this article, I will check latency from 5 DNS Server that might be the best in the world:

• Google DNS

• Cloudflare DNS

• Quad9 DNS.

• OpenDNS.

• AdGuard DNS.

Here is the table of features:

Latency check

I have checked latency when quering devops.airwallet365.com from 5 DNS Servers, the results as below:

• Google DNS: 96 ms, 132 ms, 73 ms, 75 ms, 193 ms.

• Cloudflare DNS: 55 ms, 65 ms, 64 ms, 55 ms, 66 ms.

• Quad9 DNS: 58 ms, 188 ms, 100 ms, 82 ms, 86 ms.

• Adguard DNS: 61 ms, 89 ms, 63 ms, 70 ms, 56 ms.

• OpenDNS: 62 ms, 63 ms, 64 ms, 64 ms, 66 ms.

After this round, you can see the order: Average latency, lower is better:

• Cloudflare DNS: 61 ms

• OpenDNS: 63.8 ms

• AdGuard DNS: 67.8 ms

• Quad9 DNS: 102.8 ms

• Google DNS: 113.8 ms

Double check again, I query hub.docker.com. The results as below:

• Google DNS: 66 ms, 70 ms, 78 ms, 64 ms, 79 ms.

• Cloudflare DNS: 52 ms, 62 ms, 67 ms, 63 ms, 59 ms.

• Quad9 DNS: 113 ms, 133 ms, 69 ms, 86 ms, 116 ms.

• Adguard DNS: 81 ms, 85 ms, 62 ms, 63 ms, 55 ms.

• OpenDNS: 59 ms, 56 ms, 61 ms, 57 ms, 59 ms.

After the second round, you can see the order: Average latency, lower is better:

• OpenDNS: 58.4 ms

• Cloudflare DNS: 60.6 ms

• AdGuard DNS: 69.2 ms

• Google DNS: 71.4 ms

• Quad9 DNS: 103.4 ms

As you can see from the results, OpenDNS & Cloudflare DNS have better performance than the other three.

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Google DNS

IPv4:

• 8.8.8.8

• 8.8.4.4

IPv6:

• 2001:4860:4860::8888

• 2001:4860:4860::8844

DNS over HTTPS (DoH):

• https://dns.google/dns-query – RFC 8484 (GET and POST)

• https://dns.google/resolve? – JSON API (GET)

DNS over TLS (DoT):

• tls://dns.google

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Cloudflare DNS

IPv4:

• 1.1.1.1

• 1.0.0.1

IPv6:

• 2606:4700:4700::1111

• 2606:4700:4700::1001

DNS over HTTPS (DoH):

• https://cloudflare-dns.com/dns-query

DNS over TLS (DoT):

• tls://cloudflare-dns.com

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Quad9

IPv4:

• 9.9.9.9

• 149.112.112.112

IPv6:

• 2620:fe::fe

• 2620:fe::9

DNS over HTTPS (DoH):

• https://dns.quad9.net/dns-query

DNS over TLS (DoT):

• tls://dns.quad9.net

---

AdGuard DNS

IPv4:

• 94.140.14.14

• 94.140.15.15

IPv6:

• 2a10:50c0::ad1:ff

• 2a10:50c0::ad2:ff

DNSCrypt:

• sdns://AQIAAAAAAAAAFDE3Ni4xMDMuMTMwLjEzMDo1NDQzINErR_JS3PLCu_iZEIbq95zkSV2LFsigxDIuUso_OQhzIjIuZG5zY3J5cHQuZGVmYXVsdC5uczEuYWRndWFyZC5jb20

DNS over HTTPS (DoH):

• https://dns.adguard.com/dns-query

DNS over TLS (DoT):

• tls://dns.adguard.com

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OpenDNS

IPv4:

• 208.67.222.222

• 208.67.220.220

IPv6:

• 2620:119:35::35

• 2620:119:53::53

DNS over HTTPS (DoH):

• https://doh.opendns.com/dns-query