ns22.dnns.net has no CNAME records.
Question and response
Question
dig ns22.dnns.net. NS
Answer
The response has no answer records.
Authority
dnns.net. 1744 SOA ns1.dnns.net. ariel.dominet.net. 2025102800 1400 7200 1209600 86400
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0