Apex domains cannot have CNAME records.
Question and response
Question
dig ipnettelecom.com.br. NS
Answer
ipnettelecom.com.br. 2 NS balerion.alares.network.
ipnettelecom.com.br. 2 NS scadufax.alares.network.
ipnettelecom.com.br. 2 NS gandalf.alares.network.
ipnettelecom.com.br. 2 NS dracarys.alares.network.
Authority
The response has no authority records.
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0