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[public-dns-discuss] Re: Reverse DNS Lookup issues



The "authoritative" nameserver for the 160.76.110.in-addr.arpa reverse zone for 110.76.160.224 is not authoritative (AA) for its own zone:

$ checkdelegation 110.76.160.224
224.160.76.110.in-addr.arpa.
parent zone 110.in-addr.arpa:
160.76.110.in-addr.arpa. 86400 NS ns1.infotech4all.com.

$ checkdelegation infotech4all.com
parent zone com:
infotech4all.com. 172800 NS ns1.infotech4all.com.
infotech4all.com. 172800 NS ns2.infotech4all.com.
ns1.infotech4all.com. 172800 A 110.76.160.200
ns2.infotech4all.com. 172800 A 110.76.168.200

Note absence of AA flag in response below (it is a referral response, not an answer).
Although an IP address is provided in the additional section (and some resolvers will use that), neither Google Public DNS nor dig will do so.

$ dig +norec ns1.infotech4all.com @110.76.160.200

; <<>> DiG 9.9.7-P3 <<>> +norec ns1.infotech4all.com @110.76.160.200
;; global options: +cmd
;; Got answer:
;; ->>HEADER<<- opcode: QUERY, status: NOERROR, id: 55019
;; flags: qr; QUERY: 1, ANSWER: 0, AUTHORITY: 2, ADDITIONAL: 3

;; OPT PSEUDOSECTION:
; EDNS: version: 0, flags:; udp: 4096
;; QUESTION SECTION:
;ns1.infotech4all.com. IN A

;; AUTHORITY SECTION:
infotech4all.com. 107098 IN NS ns1.infotech4all.com.
infotech4all.com. 107098 IN NS ns2.infotech4all.com.

;; ADDITIONAL SECTION:
ns1.infotech4all.com. 107098 IN A 110.76.160.200
ns2.infotech4all.com. 107098 IN A 110.76.168.200

;; Query time: 337 msec
;; SERVER: 110.76.160.200#53(110.76.160.200)
;; WHEN: Mon Feb 19 18:52:17 EST 2018
;; MSG SIZE  rcvd: 113

dig +trace likewise fails to resolve infotech4all.com or the reverse zone, failing with:

dig: couldn't get address for 'ns1.infotech4all.com': no more


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