Apex domains cannot have CNAME records.
Question and response
Question
dig ik6.net. NS
Answer
ik6.net. 2 NS ns3.ik2.com.
ik6.net. 2 NS ns1.ik2.com.
ik6.net. 2 NS ns2.ik2.com.
Authority
The response has no authority records.
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0