Question and response
Question
dig 49.20.81.in-addr.arpa. MX
Answer
49.20.81.in-addr.arpa. 3600 MX 10 cluster-e.mailcontrol.com.
49.20.81.in-addr.arpa. 3600 MX 10 cluster-b.mailcontrol.com.
49.20.81.in-addr.arpa. 3600 MX 10 cluster-f.mailcontrol.com.
49.20.81.in-addr.arpa. 3600 MX 10 cluster-d.mailcontrol.com.
Authority
49.20.81.in-addr.arpa. 3600 NS ns1.as39202.net.
49.20.81.in-addr.arpa. 3600 NS ns2.as39202.co.uk.
49.20.81.in-addr.arpa. 3600 NS ns0.as39202.net.
Additional
ns0.as39202.net. 3600 A 81.20.49.93
ns1.as39202.net. 3600 A 81.20.49.60
ns2.as39202.co.uk. 3600 A 81.20.48.93
. 0 OPT ; payload 4096, xrcode 0, version 0, flags 0