ns.pubnix.net has no CNAME records.
Question and response
Question
dig ns.pubnix.net. NS
Answer
The response has no answer records.
Authority
pubnix.net. 13748 SOA ns1.pubnix.net. root.pubnix.net. 2025085202 3600 900 2419200 86400
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0