ns2.roxer.com.br has no CNAME records.
Question and response
Question
dig ns2.roxer.com.br. NS
Answer
The response has no answer records.
Authority
roxer.com.br. 10192 SOA ns1.cprapid.com. samuel.ezoom.com.br. 2022110402 3600 1800 1209600 86400
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0