Question and response
Question
dig mx2.mailbox.org. PTR
Answer
The response has no answer records.
Authority
mailbox.org. 900 SOA ns.jpberlin.de. root.jpberlin.de. 2014137785 40000 7200 604800 86400
Additional
. 0 OPT ; payload 1480, xrcode 0, version 0, flags 0