163mx00.mxmail.netease.com has no NS records.
NS records for this zone are defined at mxmail.netease.com.
NS records for this zone are defined at mxmail.netease.com.
Question and response
Question
dig 163mx00.mxmail.netease.com. NS
Answer
The response has no answer records.
Authority
mxmail.netease.com. 600 SOA ns-split3.netease.com. admin.nease.net. 1728 600 300 3600 600
Additional
. 0 OPT ; payload 4096, xrcode 0, version 0, flags 0