mailserver.advnevescosta.com.br has no NS records.
NS records for this zone are defined at advnevescosta.com.br.
NS records for this zone are defined at advnevescosta.com.br.
Question and response
Question
dig mailserver.advnevescosta.com.br. NS
Answer
The response has no answer records.
Authority
advnevescosta.com.br. 1800 SOA kim.ns.cloudflare.com. dns.cloudflare.com. 2395184067 10000 2400 604800 1800
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0