d.dns.cn has no NS records.
NS records for this zone are defined at dns.cn.
NS records for this zone are defined at dns.cn.
Question and response
Question
dig d.dns.cn. NS
Answer
The response has no answer records.
Authority
dns.cn. 43200 SOA a.dns.cn. root.cnnic.cn. 2023110101 3600 600 1209600 43200
Additional
. 0 OPT ; payload 4096, xrcode 0, version 0, flags 0