Question and response
Question
dig mx2.mail.aliyun.com.gds.alibabadns.com. PTR
Answer
The response has no answer records.
Authority
gds.alibabadns.com. 600 SOA gdsns1.alibabadns.com. none. 2018122017 1800 600 3600 360
Additional
. 0 OPT ; payload 1280, xrcode 0, version 0, flags 0