Apex domains cannot have CNAME records.
Question and response
Question
dig binc.net. NS
Answer
binc.net. 5 NS ns4.binc.net.
binc.net. 5 NS ns3.binc.net.
binc.net. 5 NS ns1.binc.net.
binc.net. 5 NS ns2.binc.net.
Authority
The response has no authority records.
Additional
ns1.binc.net. 5 A 64.73.0.20
ns2.binc.net. 5 A 64.73.0.52
ns3.binc.net. 5 A 64.73.128.20
ns4.binc.net. 5 A 64.73.128.52
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0