intra.combr.com.br has no NS records.
NS records for this zone are defined at combr.com.br.
NS records for this zone are defined at combr.com.br.
Question and response
Question
dig intra.combr.com.br. NS
Answer
The response has no answer records.
Authority
combr.com.br. 1800 SOA justin.ns.cloudflare.com. dns.cloudflare.com. 2397054803 10000 2400 604800 1800
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0