Apex domains cannot have CNAME records.
Question and response
Question
dig dbnoc.net. NS
Answer
dbnoc.net. 4 NS dns2.hrnoc.net.
dbnoc.net. 4 NS dns1.hrnoc.net.
Authority
The response has no authority records.
Additional
dns1.hrnoc.net. 4 A 216.120.248.230
dns2.hrnoc.net. 4 A 198.8.62.25
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0