ns03.inc.cl has no CNAME records.
Question and response
Question
dig ns03.inc.cl. NS
Answer
The response has no answer records.
Authority
inc.cl. 6415 SOA ns1.inc.cl. reportes.hostname.cl. 2026022000 3600 1800 1209600 86400
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0