Apex domains cannot have CNAME records.
Question and response
Question
dig instandomainsearch.com. NS
Answer
instandomainsearch.com. 5 NS ns2.instandomainsearch.com.
instandomainsearch.com. 5 NS ns1.instandomainsearch.com.
Authority
The response has no authority records.
Additional
ns1.instandomainsearch.com. 5 A 62.212.87.50
ns2.instandomainsearch.com. 5 A 95.211.69.112
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0