Apex domains cannot have CNAME records.
Question and response
Question
dig iaires.com. NS
Answer
iaires.com. 5 NS ns4.netcore.co.in.
iaires.com. 5 NS ns3.netcore.co.in.
iaires.com. 5 NS ns1.netcore.co.in.
Authority
The response has no authority records.
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0