dns2.cnsnext.com has no NS records.
NS records for this zone are defined at cnsnext.com.
NS records for this zone are defined at cnsnext.com.
Question and response
Question
dig dns2.cnsnext.com. NS
Answer
The response has no answer records.
Authority
cnsnext.com. 38400 SOA dns1.cnsnext.com. noc.cns-internet.com. 2026011301 10800 3600 604800 38400
Additional
. 0 OPT ; payload 4096, xrcode 0, version 0, flags 0