Apex domains cannot have CNAME records.
Question and response
Question
dig entelo.com. NS
Answer
entelo.com. 5 NS ns-965.awsdns-56.net.
entelo.com. 5 NS ns-347.awsdns-43.com.
entelo.com. 5 NS ns-1714.awsdns-22.co.uk.
entelo.com. 5 NS ns-1103.awsdns-09.org.
Authority
The response has no authority records.
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0