Apex domains cannot have CNAME records.
Question and response
Question
dig codetel.net.do. NS
Answer
codetel.net.do. 3 NS ns2.claro.net.do.
codetel.net.do. 3 NS ns1.claro.net.do.
Authority
The response has no authority records.
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0