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[DNSOP] HTTPS/SVCB on Cloudflare DNS

Alessandro Ghedini <alessandro@ghedini.me> Thu, 16 July 2020 15:14 UTC

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Date: Thu, 16 Jul 2020 16:13:56 +0100
From: Alessandro Ghedini <alessandro@ghedini.me>
To: dnsop@ietf.org
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Subject: [DNSOP] HTTPS/SVCB on Cloudflare DNS
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Hello,

Just a quick note that we have started serving "HTTPS" DNS records from
Cloudflare's authoritative DNS servers. Our main use-case right now is
advertising HTTP/3 support for those customers that enabled that feature (in
addition to using Alt-Svc HTTP headers).

If anyone is interested in trying this out you can query pretty much all domains
served by Cloudflare DNS for which we terminate HTTP.

For example:

   % dig blog.cloudflare.com type65

  ; <<>> DiG 9.16.4-Debian <<>> blog.cloudflare.com type65
  ;; global options: +cmd
  ;; Got answer:
  ;; ->>HEADER<<- opcode: QUERY, status: NOERROR, id: 17291
  ;; flags: qr rd ra; QUERY: 1, ANSWER: 1, AUTHORITY: 0, ADDITIONAL: 1

  ;; OPT PSEUDOSECTION:
  ; EDNS: version: 0, flags:; udp: 4096
  ;; QUESTION SECTION:
  ;blog.cloudflare.com.		IN	TYPE65

  ;; ANSWER SECTION:
  blog.cloudflare.com.	300	IN	TYPE65	\# 76 000100000100150568332D32390568332D32380568332D3237026832 0004000868121A2E68121B2E00060020260647000000000000000000 68121A2E26064700000000000000000068121B2E

Cheers

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