Apex domains cannot have CNAME records.
Question and response
Question
dig alares.tec.br. NS
Answer
alares.tec.br. 5 NS dracarys.ns.alares.tec.br.
alares.tec.br. 5 NS gandalf.ns.alares.tec.br.
alares.tec.br. 5 NS balerion.ns.alares.tec.br.
alares.tec.br. 5 NS scadufax.ns.alares.tec.br.
Authority
The response has no authority records.
Additional
gandalf.ns.alares.tec.br. 5 A 205.251.198.155
balerion.ns.alares.tec.br. 5 A 205.251.197.109
dracarys.ns.alares.tec.br. 5 A 205.251.194.254
scadufax.ns.alares.tec.br. 5 A 205.251.192.91
gandalf.ns.alares.tec.br. 5 AAAA 2600:9000:5306:9b00:0:0:0:1
balerion.ns.alares.tec.br. 5 AAAA 2600:9000:5305:6d00:0:0:0:1
dracarys.ns.alares.tec.br. 5 AAAA 2600:9000:5302:fe00:0:0:0:1
scadufax.ns.alares.tec.br. 5 AAAA 2600:9000:5300:5b00:0:0:0:1
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0