Question and response
Question
dig mx3.cogentco.com. PTR
Answer
The response has no answer records.
Authority
cogentco.com. 43200 SOA auth1.dns.cogentco.com. dns.cogentco.com. 2026020802 10800 3600 604800 43200
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0