Apex domains cannot have CNAME records.
Question and response
Question
dig ivanentel.com. NS
Answer
ivanentel.com. 1 NS ns1.ivanentel.com.
ivanentel.com. 1 NS ns2.ivanentel.com.
Authority
The response has no authority records.
Additional
ns1.ivanentel.com. 1 A 190.2.147.19
ns2.ivanentel.com. 1 A 190.2.147.95
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0