b01.seguroz.com.br has no NS records.
NS records for this zone are defined at seguroz.com.br.
NS records for this zone are defined at seguroz.com.br.
Question and response
Question
dig b01.seguroz.com.br. NS
Answer
The response has no answer records.
Authority
seguroz.com.br. 1800 SOA davina.ns.cloudflare.com. dns.cloudflare.com. 2397340519 10000 2400 604800 1800
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0