ns2.webcerta.com.br has no NS records.
NS records for this zone are defined at com.br.
NS records for this zone are defined at com.br.
Question and response
Question
dig ns2.webcerta.com.br. NS
Answer
The response has no answer records.
Authority
ns2.webcerta.com.br. 3783 SOA ns1.w3connect.com.br. felipe.deieno.com.br. 2017121501 3600 7200 1209600 86400
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0