Apex domains cannot have CNAME records.
Question and response
Question
dig hostinger.es. NS
Answer
hostinger.es. 3 NS any1.hostinger.com.
hostinger.es. 3 NS any2.hostinger.com.
Authority
The response has no authority records.
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0