Hey,
we’re using 9.9.9.9 to resolve the IP address of ns5.atw.hu
:
$ dig @9.9.9.9 a ns5.atw.hu
; <<>> DiG 9.11.5-P4-5~bpo9+1-Debian <<>> @9.9.9.9 a ns5.atw.hu
; (1 server found)
;; global options: +cmd
;; Got answer:
;; ->>HEADER<<- opcode: QUERY, status: NXDOMAIN, id: 17844
;; flags: qr rd ad; QUERY: 1, ANSWER: 0, AUTHORITY: 0, ADDITIONAL: 1
;; WARNING: recursion requested but not available
;; OPT PSEUDOSECTION:
; EDNS: version: 0, flags:; udp: 1500
;; QUESTION SECTION:
;ns5.atw.hu. IN A
;; Query time: 21 msec
;; SERVER: 9.9.9.9#53(9.9.9.9)
;; WHEN: Thu Nov 12 14:04:16 CET 2020
;; MSG SIZE rcvd: 39
And indeed, Quad9 blocks that address: https://www.quad9.net/result/?url=ns5.atw.hu
I’ll look into changing the upstream DNS server we’re using. Google (8.8.8.8) and Cloudflare (1.1.1.1) do return a usable answer. I’ll keep you posted.