ns2.rr64.com.br has no CNAME records.
Question and response
Question
dig ns2.rr64.com.br. NS
Answer
The response has no answer records.
Authority
rr64.com.br. 10690 SOA ns1.rr64.com.br. suporte.rr64.net. 2026022301 3600 1800 86400 21600
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0