Apex domains cannot have CNAME records.
Question and response
Question
dig hkbn.net. NS
Answer
hkbn.net. 5 NS a5-66.akam.net.
hkbn.net. 5 NS a24-67.akam.net.
hkbn.net. 5 NS a11-66.akam.net.
hkbn.net. 5 NS a2-66.akam.net.
hkbn.net. 5 NS a26-64.akam.net.
hkbn.net. 5 NS a1-138.akam.net.
Authority
The response has no authority records.
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0