dns9.itsweb.com.br has no NS records.
NS records for this zone are defined at itsweb.com.br.
NS records for this zone are defined at itsweb.com.br.
Question and response
Question
dig dns9.itsweb.com.br. NS
Answer
The response has no answer records.
Authority
itsweb.com.br. 10800 SOA dns9.itsweb.com.br. redes.itsbrasil.net. 2026011502 10800 3600 1382400 10800
Additional
. 0 OPT ; payload 4096, xrcode 0, version 0, flags 0