ns02.zaapnet.com.br has no CNAME records.
Question and response
Question
dig ns02.zaapnet.com.br. NS
Answer
The response has no answer records.
Authority
zaapnet.com.br. 3868 SOA ns01.zaapnet.com.br. suporte.zaapnet.com.br. 2026021202 86400 43200 604800 10800
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0