ns2.webcerta.net.br has no CNAME records.
Question and response
Question
dig ns2.webcerta.net.br. NS
Answer
The response has no answer records.
Authority
webcerta.net.br. 10800 SOA ns1.w3connect.com.br. logs.deieno.com.br. 2026012601 3600 1800 1209600 86400
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0