mx.dka.mailcore.net.
Question and response
Question
dig 80.0-127.134.19.194.in-addr.arpa. PTR
Answer
80.0-127.134.19.194.in-addr.arpa. 3600 PTR mx.dka.mailcore.net.
Authority
0-127.134.19.194.in-addr.arpa. 3600 NS pns24.cloudns.net.
0-127.134.19.194.in-addr.arpa. 3600 NS pns23.cloudns.net.
0-127.134.19.194.in-addr.arpa. 3600 NS pns22.cloudns.net.
0-127.134.19.194.in-addr.arpa. 3600 NS pns21.cloudns.net.
Additional
. 0 OPT ; payload 4096, xrcode 0, version 0, flags 0