Apex domains cannot have CNAME records.
Question and response
Question
dig kioit.com. NS
Answer
kioit.com. 4 NS ns2.kioit.com.
kioit.com. 4 NS ns4.kioit.com.
kioit.com. 4 NS ns1.kioit.com.
kioit.com. 4 NS ns3.kioit.com.
Authority
The response has no authority records.
Additional
ns1.kioit.com. 4 A 200.77.231.205
ns2.kioit.com. 4 A 200.77.237.246
ns3.kioit.com. 4 A 200.77.227.157
ns4.kioit.com. 4 A 201.175.23.168
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0