srv01.nuva.com.br has no NS records.
NS records for this zone are defined at nuva.com.br.
NS records for this zone are defined at nuva.com.br.
Question and response
Question
dig srv01.nuva.com.br. NS
Answer
The response has no answer records.
Authority
nuva.com.br. 1800 SOA ns1.udns.com.br. contato.tmsoft.com.br. 2016062715 10800 900 604800 86400
Additional
. 0 OPT ; payload 4096, xrcode 0, version 0, flags 0