Apex domains cannot have CNAME records.
Question and response
Question
dig cablecom.net. NS
Answer
cablecom.net. 2 NS ns1.cablecom.net.
cablecom.net. 2 NS ns2.cablecom.net.
Authority
The response has no authority records.
Additional
ns1.cablecom.net. 2 A 195.34.133.133
ns2.cablecom.net. 2 A 213.47.222.133
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0