NS4.LACNIC.NET has no CNAME records.
Question and response
Question
dig NS4.LACNIC.NET. NS
Answer
The response has no answer records.
Authority
lacnic.net. 244 SOA NS.LACNIC.NET. Hostmaster.LACNIC.NET. 2026012807 7200 3600 648736 600
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0