Apex domains cannot have CNAME records.
Question and response
Question
dig cantv.net. NS
Answer
cantv.net. 5 NS ns2.cantv.net.
cantv.net. 5 NS dns1.cantv.net.
cantv.net. 5 NS dns2.cantv.net.
cantv.net. 5 NS ns1.cantv.net.
Authority
The response has no authority records.
Additional
ns1.cantv.net. 5 A 200.44.1.27
ns2.cantv.net. 5 A 201.248.77.5
dns1.cantv.net. 5 A 200.44.1.28
dns2.cantv.net. 5 A 201.248.77.6
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0