Apex domains cannot have CNAME records.
Question and response
Question
dig estacionesruta.com. NS
Answer
estacionesruta.com. 5 NS ns-1175.awsdns-18.org.
estacionesruta.com. 5 NS ns-1685.awsdns-18.co.uk.
estacionesruta.com. 5 NS ns-1834.awsdns-37.co.uk.
estacionesruta.com. 5 NS ns-1845.awsdns-38.co.uk.
Authority
The response has no authority records.
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0