Apex domains cannot have CNAME records.
Question and response
Question
dig schip.com.br. NS
Answer
schip.com.br. 5 NS dns1.eas.com.br.
schip.com.br. 5 NS dns2.eas.com.br.
Authority
The response has no authority records.
Additional
dns1.eas.com.br. 5 A 148.72.144.16
dns2.eas.com.br. 5 A 148.72.177.124
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0