Apex domains cannot have CNAME records.
Question and response
Question
dig vendido1-2-3.com. NS
Answer
vendido1-2-3.com. 5 NS ns-1138.awsdns-14.org.
vendido1-2-3.com. 5 NS ns-2013.awsdns-59.co.uk.
vendido1-2-3.com. 5 NS ns-309.awsdns-38.com.
vendido1-2-3.com. 5 NS ns-611.awsdns-12.net.
Authority
The response has no authority records.
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0