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