DNS over HTTPS (DoH) Servers

I recently conducted some research into DNS over HTTPS (DoH) that is documented here. When it came to identifying any publically available DoH servers available on the Internet I found the best resource to be the curl wiki page to be the best place to start and is probably the most well maintained resource.

I found a few more so I have merged them into the below list and also put together a simple script to do a test GET query against each resolver.

Below is the list of potential endpoints:

• dns.google.com
• cloudflare-dns.com
• 1.1.1.1
• mozilla.cloudflare-dns.com
• dns9.quad9.net
• dns10.quad9.net
• dns.quad9.net
• doh.cleanbrowsing.org
• dns.dnsoverhttps.net
• doh.crypto.sx
• doh.powerdns.org
• doh.securedns.eu
• doh.ibr.cs.tu-bs.de
• doh.eieidns.com
• doh.blahdns.com
• doh.de.blahdns.com
• doh.defaultroutes.de
• doh.bugdns.com
• doh.datt.pw
• doh.ntu.ssooss.win
• dns.dnsoverhttps.net
• dns.dns-over-https.com
• dns.rubyfish.cn
• doh.qis.io
• public.dns.iij.jp
• dns.nextdns.io
• dns.switch.ch
• jp.tiar.app

The test script is available at the below URL: https://gist.github.com/dtmsecurity/a849e985e6a0b61aeb54890ebcfa55eb

If you run the script you will see that a small number resolvers do not support GET style queries.