Apex domains cannot have CNAME records.
Question and response
Question
dig espacioinfinito.net. NS
Answer
espacioinfinito.net. 4 NS ns2.reseller-225.mco2.hostdime.com.
espacioinfinito.net. 4 NS ns1.reseller-225.mco2.hostdime.com.
Authority
The response has no authority records.
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0