m320.mail.163.com has no NS records.
NS records for this zone are defined at 163.com.
NS records for this zone are defined at 163.com.
Question and response
Question
dig hdweb.mail.ntes53.netease.com. NS
Answer
The response has no answer records.
Authority
ntes53.netease.com. 60 SOA ns1-ntes53.netease.com. admin.nease.net. 20161744 600 300 3600 60
Additional
. 0 OPT ; payload 4096, xrcode 0, version 0, flags 0