nameserver2.avato.com.br has no CNAME records.
Question and response
Question
dig nameserver2.avato.com.br. NS
Answer
The response has no answer records.
Authority
avato.com.br. 300 SOA nameserver1.avato.com.br. root.avato.com.br. 1771953946 3600 900 604800 3600
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0