ns72.cloudns.com has no CNAME records.
Question and response
Question
dig ns72.cloudns.com. NS
Answer
The response has no answer records.
Authority
cloudns.com. 3337 SOA pns1.cloudns.net. support.cloudns.net. 2026021701 7200 1800 1209600 3600
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0