labs.ctbc.com.br has no NS records.
NS records for this zone are defined at ctbc.com.br.
NS records for this zone are defined at ctbc.com.br.
Question and response
Question
dig labs.ctbc.com.br. NS
Answer
The response has no answer records.
Authority
ctbc.com.br. 1800 SOA tricia.ns.cloudflare.com. dns.cloudflare.com. 2397335411 10000 2400 604800 1800
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0