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Basj
Asked: 2017-09-11 05:02:34 +0800 CST

Reverse PTR record lookup not working with dig

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As mentioned here, having a Reverse PTR record is key for successful email sending and delivery from one's own server. In order to check if it's correctly set for my server, I tried:

dig -x 111.111.111.111    #  replace with the IP of a server

but the answer is:

; <<>> DiG 9.9.5-3ubuntu0.1-Ubuntu <<>> -x 111.111.111.111
;; global options: +cmd
;; Got answer:
;; ->>HEADER<<- opcode: QUERY, status: SERVFAIL, id: 29789
;; flags: qr rd ra; QUERY: 1, ANSWER: 0, AUTHORITY: 0, ADDITIONAL: 1

;; OPT PSEUDOSECTION:
; EDNS: version: 0, flags:; udp: 4096
;; QUESTION SECTION:
;xxx.xxx.xxx.xxx.in-addr.arpa.     IN      PTR

;; Query time: 27 msec
;; SERVER: 127.0.0.1#53(127.0.0.1)
;; WHEN: Sun Sep 10 14:51:32 CEST 2017
;; MSG SIZE  rcvd: 54

I don't see anything that looks like a Reverse PTR record.

I tried with various IPs obtained from well-known websites: dig -x 151.101.1.69 (obtained from ping stackoverflow.com), and it looks the same.

Why can't I see any Reverse PTR record with dig?

email

1 Answers

  1. I tried from another server and it works:

    ;; ANSWER SECTION:
xxx.xxx.xxx.xxx.in-addr.arpa. 86399 IN     PTR     ns328xxxx.ip-xxx-xxx-xxx.eu.

    so it should be a local server problem (as mentioned by someone in a comment).

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