firewall.borrazopolis.ivatel.com.br has no NS records.
NS records for this zone are defined at ivatel.com.br.
NS records for this zone are defined at ivatel.com.br.
Question and response
Question
dig firewall.borrazopolis.ivatel.com.br. NS
Answer
The response has no answer records.
Authority
ivatel.com.br. 38400 SOA ns1.ivatel.com.br. suporte.ivatel.com.br. 1476721570 10800 3600 604800 38400
Additional
. 0 OPT ; payload 4096, xrcode 0, version 0, flags 0