mx01.nuva.net.br has no NS records.
NS records for this zone are defined at nuva.net.br.
NS records for this zone are defined at nuva.net.br.
Question and response
Question
dig mx01.nuva.net.br. NS
Answer
The response has no answer records.
Authority
nuva.net.br. 1800 SOA ns1.udns.com.br. contato.tmsoft.com.br. 2020081500 10800 900 604800 86400
Additional
. 0 OPT [{Extended_DNS_Error: PROHIBITED}] ; payload 1232, xrcode 0, version 0, flags 0