fails to resolve is-cf.help.every1dns.net if any part of is-cf is uppercase fails to resolve is-cf.help.every1dns.net (used by if any part of is-cf is uppercase. This breaks the site for DNS resolvers such as Knot resolver which randomly capitalise letters.

The same appears to be true for and It appears that ns.help.every1dns.net doesn’t support dns-0x20 and treats queries as case sensitive.

dig is-cF.help.every1dns.net @ns.help.every1dns.net

; <<>> DiG 9.10.6 <<>> is-cF.help.every1dns.net @ns.help.every1dns.net
;; global options: +cmd
;; Got answer:
;; ->>HEADER<<- opcode: QUERY, status: NXDOMAIN, id: 3832
;; flags: qr aa rd; QUERY: 1, ANSWER: 0, AUTHORITY: 1, ADDITIONAL: 1
;; WARNING: recursion requested but not available

; EDNS: version: 0, flags:; udp: 4096
;is-cF.help.every1dns.net.	IN	A

help.every1dns.net.	0	IN	SOA	help.every1dns.net. dns.cloudflare.com. 2018100101 21600 3600 604800 0

ns.help.every1dns.net always responds with an NXDOMAIN unless the request comes via which is how the site determines whether the request is through

Additionally case sensitivity only matters in the is-cf part.

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This should be fixed now, sorry for the issues.