ns03.lestetelecom.com.br has no CNAME records.
Question and response
Question
dig ns03.lestetelecom.com.br. NS
Answer
The response has no answer records.
Authority
lestetelecom.com.br. 1637 SOA 186.211.32.85. suporte.gigaline.com.br. 2026021003 7200 540 604800 3600
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0