mailserver.dirfhipercard.com.br has no NS records.
NS records for this zone are defined at dirfhipercard.com.br.
NS records for this zone are defined at dirfhipercard.com.br.
Question and response
Question
dig mailserver.dirfhipercard.com.br. NS
Answer
The response has no answer records.
Authority
dirfhipercard.com.br. 1800 SOA kim.ns.cloudflare.com. dns.cloudflare.com. 2394033174 10000 2400 604800 1800
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0