smtp-old-2.wx3.se.
Question and response
Question
dig 134.128-255.24.37.212.in-addr.arpa. PTR
Answer
134.128-255.24.37.212.in-addr.arpa. 3600 PTR smtp-old-2.wx3.se.
Authority
The response has no authority records.
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0