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

Hi Alex,

Thank you for the quick response. I don't see any records for infotech4all.com. This is decommissioned long back. Can you please check now and validate ? I am not sure on what needs to be done from my end


On Tuesday, February 20, 2018 at 5:29:03 AM UTC+5:30, Alex Dupuy wrote:
The "authoritative" nameserver for the 160.76.110.in-addr.arpa reverse zone for is not authoritative (AA) for its own zone:

$ checkdelegation
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
ns2.infotech4all.com. 172800 A

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 @

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

; EDNS: version: 0, flags:; udp: 4096
;ns1.infotech4all.com. IN A

infotech4all.com. 107098 IN NS ns1.infotech4all.com.
infotech4all.com. 107098 IN NS ns2.infotech4all.com.

ns1.infotech4all.com. 107098 IN A
ns2.infotech4all.com. 107098 IN A

;; Query time: 337 msec
;; 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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