Apex domains cannot have CNAME records.
Question and response
Question
dig panter.cl. NS
Answer
panter.cl. 5 NS ns04.inc.cl.
panter.cl. 5 NS ns02.inc.cl.
panter.cl. 5 NS ns01.inc.cl.
panter.cl. 5 NS ns03.inc.cl.
Authority
The response has no authority records.
Additional
ns01.inc.cl. 5 A 201.159.174.100
ns02.inc.cl. 5 A 64.120.17.98
ns03.inc.cl. 5 A 190.110.120.101
ns04.inc.cl. 5 A 190.110.120.100
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0