Improvement Request: Indicate CNAME-loop as separate EDE status

I’m using Cloudflare’s DNS over HTTPS API and have been testing what the output would be if a CNAME-loop occurs.

Cloudflare returns an EDE code of 22 (No reachable authority).

Although this is technically correct according to the RFC 8914, quote:

The resolver could not reach any of the authoritative name servers (or they potentially refused to reply)

It is also a bit ambiguous since the authority is reachable (the 2 domains that I used for this test both use Cloudflare as their nameserver).

Using EDE code 0 other with an EXTRA-TEXT indicating the loop would be more suitable.

Google’s DNS ( already does this, with Dig returning (domain name replaced with an example):

; EDNS: version: 0, flags:; udp: 512
; EDE: 0 (Other): (CNAME cycle at

vs Cloudflare’s:

; EDNS: version: 0, flags:; udp: 1232
; EDE: 22 (No Reachable Authority)