mailserver.aowin.com.br has no NS records.
NS records for this zone are defined at aowin.com.br.
NS records for this zone are defined at aowin.com.br.
Question and response
Question
dig mailserver.aowin.com.br. NS
Answer
The response has no answer records.
Authority
aowin.com.br. 3600 SOA ns1.gegnet.net.br. suporte.gegnet.net.br. 2025021081 3600 3600 86400 3600
Additional
. 0 OPT ; payload 4096, xrcode 0, version 0, flags 0