dc-smtp.oxfordnetworks.com.
Question and response
Question
dig 4.0-27.212.231.66.in-addr.arpa. PTR
Answer
4.0-27.212.231.66.in-addr.arpa. 900 PTR dc-smtp.oxfordnetworks.com.
Authority
The response has no authority records.
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0