mail.emfibra.net.br has no NS records.
NS records for this zone are defined at emfibra.net.br.
NS records for this zone are defined at emfibra.net.br.
Question and response
Question
dig mail.emfibra.net.br. NS
Answer
The response has no answer records.
Authority
emfibra.net.br. 86400 SOA ns914.hostgator.com.br. root.br914.hostgator.com.br. 2026031323 86400 7200 3600000 86400
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0