Apex domains cannot have CNAME records.
Question and response
Question
dig eliascomunicaciones.com. NS
Answer
eliascomunicaciones.com. 5 NS ns2.eliascomunicaciones.com.
eliascomunicaciones.com. 5 NS ns1.eliascomunicaciones.com.
Authority
The response has no authority records.
Additional
ns1.eliascomunicaciones.com. 5 A 45.5.10.11
ns2.eliascomunicaciones.com. 5 A 45.5.10.10
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0