Apex domains cannot have CNAME records.
Question and response
Question
dig casadelcordon.net.do. NS
Answer
casadelcordon.net.do. 3 NS ns-1839.awsdns-37.co.uk.
casadelcordon.net.do. 3 NS ns-350.awsdns-43.com.
casadelcordon.net.do. 3 NS ns-947.awsdns-54.net.
casadelcordon.net.do. 3 NS ns-1095.awsdns-08.org.
Authority
The response has no authority records.
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0