srv01.dnw.cl has no CNAME records.
Question and response
Question
dig srv01.dnw.cl. NS
Answer
The response has no answer records.
Authority
dnw.cl. 145 SOA dns1.dnw.cl. root.raid-dnw.dnw.cl. 2026022300 3600 1800 1209600 86400
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0