Apex domains cannot have CNAME records.
Question and response
Question
dig hosting24.com. NS
Answer
hosting24.com. 4 NS dns2.hostinger.com.
hosting24.com. 4 NS dns1.hostinger.com.
Authority
The response has no authority records.
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0