mail.astralcloud.com.br has no NS records.
NS records for this zone are defined at astralcloud.com.br.
NS records for this zone are defined at astralcloud.com.br.
Question and response
Question
dig mail.astralcloud.com.br. NS
Answer
The response has no answer records.
Authority
astralcloud.com.br. 1800 SOA patryk.ns.cloudflare.com. dns.cloudflare.com. 2397253354 10000 2400 604800 1800
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0