mail.cneinfo.com has no NS records.
NS records for this zone are defined at cneinfo.com.
NS records for this zone are defined at cneinfo.com.
Question and response
Question
dig mail.cneinfo.com. NS
Answer
The response has no answer records.
Authority
cneinfo.com. 3600 SOA ns.cneinfo.com. mail.cneinfo.com. 2025101701 10800 3600 432000 3600
Additional
. 0 OPT ; payload 4096, xrcode 0, version 0, flags 0