There were some occasions to post this in a few threads.
So now I put it in a place.
Feel free to recommend DNS providers I should add (or remove).
Or anything else I suppose.
Example run
$ dnsdig
Test common resolvers by calculating average response times of 3 queries.
---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
DNS Primary Secondary
AdGuard 94.140.14.14 94.140.15.15
CleanBrowsing 185.228.168.9 185.228.169.9
Cloudflare 1.1.1.1 1.0.0.1
Comodo 8.26.56.26 8.20.247.20
Control-D 76.76.2.2 76.76.10.2
dns0.eu 193.110.81.0 185.253.5.0
DNSFilter 103.247.36.36 103.247.37.37
Dyn/Oracle 216.146.35.35 216.146.36.36
FlashStart 185.236.104.104 185.236.105.105
Gcore 95.85.95.85 2.56.220.2
Google 8.8.8.8 8.8.4.4
Level3/Lumen 209.244.0.3 209.244.0.4
NextDNS 45.90.28.105 45.90.30.105
OpenDNS/Cisco 208.67.222.222 208.67.220.220
Quad9 9.9.9.9 149.112.112.112
SafeDNS 195.46.39.39 195.46.39.40
UltraDNS/Vercara 64.6.64.6 64.6.65.6
---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
Do you wish to flush the DNS cache (y/N)? y
Current DNS 127.0.0.53
Avg time: 3.33333 ms
FlashStart 185.236.104.104
Avg time: 8.66667 ms
Cloudflare 1.1.1.1
Avg time: 17.6667 ms
SafeDNS 195.46.39.39
Avg time: 18.3333 ms
Control-D 76.76.2.2
Avg time: 28.3333 ms
Quad9 9.9.9.9
Avg time: 28.3333 ms
DNSFilter 103.247.36.36
Avg time: 29.3333 ms
NextDNS 45.90.28.105
Avg time: 29.3333 ms
Level3/Lumen 209.244.0.3
Avg time: 30 ms
UltraDNS/Vercara 64.6.64.6
Avg time: 36 ms
AdGuard 94.140.14.14
Avg time: 47 ms
OpenDNS/Cisco 208.67.222.222
Avg time: 50.6667 ms
Google 8.8.8.8
Avg time: 56 ms
Comodo 8.26.56.26
Avg time: 79.3333 ms
CleanBrowsing 185.228.168.9
Avg time: 94.3333 ms
Gcore 95.85.95.85
Avg time: 103.333 ms
dns0.eu 193.110.81.0
Avg time: 212 ms
Dyn/Oracle 216.146.35.35
Avg time: 241.667 ms
Note
As with many of my scripts .. this can be run remotely, with no need to download, as well:
Usage: dnsdig
Options:
-h, --help Display this help message
Environment Variables:
DOMAIN Set the lookup domain
SKIP Skip the regular tests and header
TESTDNS Custom DNS server to test
From my region the following are the top 14 fastest DNS server. It is funny that Google DNS and Oracle DNS did not make the cut. But OpenDNS and FlashStart did.
Not surprised that Cloudflare is there in the top 5. It is one of the most fastest DNS out there.
Firefox uses NextDNS, which is at the bottom, for Increased protection, i.e. secure DNS. Maybe it does make sense to shift to cloudflare DNS for using Secure DNS.
OpenDNS/Cisco 208.67.222.222
Avg time: 14 ms
DNSFilter 103.247.36.36
Avg time: 15 ms
FlashStart 185.236.104.104
Avg time: 17.3333 ms
Cloudflare 1.1.1.1
Avg time: 20 ms
Quad9 9.9.9.9
Avg time: 25 ms
SafeDNS 195.46.39.39
Avg time: 28.6667 ms
Comodo 8.26.56.26
Avg time: 43 ms
CleanBrowsing 185.228.168.9
Avg time: 44 ms
UltraDNS/Vercara 64.6.64.6
Avg time: 44 ms
AdGuard 94.140.14.14
Avg time: 47.3333 ms
Level3/Lumen 209.244.0.3
Avg time: 51.6667 ms
NextDNS 45.90.28.105
Avg time: 86.3333 ms
Note 
