ns1.i4telecom.com.br has no CNAME records.
Question and response
Question
dig ns1.i4telecom.com.br. NS
Answer
The response has no answer records.
Authority
i4telecom.com.br. 4149 SOA ns1.i4telecom.com.br. noc\@i4telecom.com.br. 2025030937 43200 7200 2419200 86400
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0