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Cloudflare reverse DNS SERVFAIL, normal?
* owen at delong.com (Owen DeLong) [Wed 31 Aug 2016, 01:47 CEST]:
>You don?t get NXDOMAIN when a nameserver gets a request for a zone
>it doesn?t serve.
Correct in most cases (there's an edge case where a server is [mis]
configured as authoritative with its own empty . and its regular
zones and allows global querying; it's similar to asking a root
server for anything in a nonexistent TLD).
>You either get SERVFAIL or you get NS records back as a referral.