Apex domains cannot have CNAME records.
Question and response
Question
dig ranolumeti.com. NS
Answer
ranolumeti.com. 5 NS ns-1903.awsdns-45.co.uk.
ranolumeti.com. 5 NS ns-1151.awsdns-15.org.
ranolumeti.com. 5 NS ns-669.awsdns-19.net.
ranolumeti.com. 5 NS ns-1984.awsdns-56.co.uk.
Authority
The response has no authority records.
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0