Apex domains cannot have CNAME records.
Question and response
Question
dig inucn.com. NS
Answer
inucn.com. 5 NS ns2.inucn.com.
inucn.com. 5 NS ns1.inucn.com.
Authority
The response has no authority records.
Additional
ns1.inucn.com. 5 A 207.166.92.10
ns2.inucn.com. 5 A 207.166.95.10
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0