Try doing an nslookup on that domain I did, otherwise I would probably have to ask @cs-cf help… Every POP should reply identically, if there are issue related to a single POP they would have to check internally.
Appears to be some issues communicating with their DNS servers from certain colos. They don’t have contact info in whois so we tried to reach out to them by other means. But until we hear back probably not much/anything we can do unfortunately.
Found that these subdomains also have problems
www. habr. com
m. habr. com
/added spaces to prevent link conversion/
So it looks like you may be in contact with some folks on the resolver team directly already, so I’ll let them work the issue for you (looks like they may have soem results for you shortly)
Hello,
I am facing the same issue with a quite popular domain “waterland.gr”. Is this a misconfiguration on the DNS holding that registration?
It seems that 1.1.1.1 cannot reach or resolve ns31.040services.net which from the DNS report appear as the parent servers. From the reverse report it seems that all the following domains are not resolving from DNS 1.1.1.1 and 1.0.0.1 for the same reason:
Again I am wandering if this is an issue on the 1.1.1.1 DNS service or on the side of the arent servers? I trully would like to help and make the 1.1.1.1 DNS service better.
The issue is the nameservers for 040services.net return this when asked for AAAA:
$ kdig @ns0.nl ns30.040services.net. AAAA
;; ->>HEADER<<- opcode: QUERY; status: NOERROR; id: 56481
;; Flags: qr rd; QUERY: 1; ANSWER: 0; AUTHORITY: 1; ADDITIONAL: 0
;; QUESTION SECTION:
;; ns30.040services.net. IN AAAA
;; AUTHORITY SECTION:
ns30.040services.net. 86400 IN NS ns30.040services.net.
;; Received 92 B
;; Time 2018-08-28 20:38:00 PDT
This answer doesn’t mean anything. If it’s a referral it’s missing an address of the nameserver, otherwise it’s a cyclic dependency. If it’s an attempt to negative answer, it’s missing the AA bit. My understanding is that they wanted to add glue records for these delegations, but didn’t for some reason. I opened a support ticket with 040services.net few months ago, but it didn’t get resolved.
Hello,
thanks for the prompt and detailed answer! From the few little things that I know regarding DNS, I would totally agree with you.
Weird things! First, after the reverse report I started browsing sites that didn’t resolve through a VPN and a private DNS cache and realized that if not all, most of the sites were build form the same company, which I happen to know the owner personally, so I will inform regarding this. Second, it seems that today the domains are resolving properly from 1.1.1.1!
Could that be just a temporary issue? Not sure to be honest! 
I added a workaround for this name to ignore the AAAA lookups, but that’s about what I can do. Surely other domains on this nameserver must be broken.