ns1.onitel.com.br has no NS records.
NS records for this zone are defined at onitel.com.br.
NS records for this zone are defined at onitel.com.br.
Question and response
Question
dig ns1.onitel.com.br. NS
Answer
The response has no answer records.
Authority
onitel.com.br. 2880 SOA ns1.onitel.com.br. root.onitel.com.br. 20191145 28800 7200 2419200 86400
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0