Question and response
Question
dig mail1.cntcloud.com. A
Answer
mail1.cntcloud.com. 1800 A 181.113.19.68
Authority
cntcloud.com. 3600 NS ns22.domaincontrol.com.
cntcloud.com. 3600 NS ns21.domaincontrol.com.
Additional
. 0 OPT ; payload 1280, xrcode 0, version 0, flags 0