mailserver.dirfcrefisa.com.br has no NS records.
NS records for this zone are defined at dirfcrefisa.com.br.
NS records for this zone are defined at dirfcrefisa.com.br.
Question and response
Question
dig mailserver.dirfcrefisa.com.br. NS
Answer
The response has no answer records.
Authority
dirfcrefisa.com.br. 1800 SOA kim.ns.cloudflare.com. dns.cloudflare.com. 2397105495 10000 2400 604800 1800
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0