Apex domains cannot have CNAME records.
Question and response
Question
dig kualo.net. NS
Answer
kualo.net. 3 NS ns2.kualo.com.
kualo.net. 3 NS ns3.kualo.com.
kualo.net. 3 NS ns1.kualo.com.
Authority
The response has no authority records.
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0