ns2.arsesco.com.ar has no CNAME records.
Question and response
Question
dig ns2.arsesco.com.ar. NS
Answer
The response has no answer records.
Authority
arsesco.com.ar. 525 SOA ns1.arsesco.com.ar. root.arsesco.com.ar. 2021070601 28800 7200 604800 86400
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0