dynamic.n4telecom.com.br has no CNAME records.
Question and response
Question
dig dynamic.n4telecom.com.br. NS
Answer
The response has no answer records.
Authority
n4telecom.com.br. 9643 SOA ns1.he.net. hostmaster.he.net. 2026021600 86400 7200 3600000 172800
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0