ns2.cdnetdns.net has no CNAME records.
Question and response
Question
dig ns2.cdnetdns.net. NS
Answer
The response has no answer records.
Authority
cdnetdns.net. 60 SOA b.qtlcdncn.info. dnsadmin.cdnetworks.com. 2023080801 3600 900 604800 60
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0