ns2.adc.net.ar has no CNAME records.
Question and response
Question
dig ns2.adc.net.ar. NS
Answer
The response has no answer records.
Authority
adc.net.ar. 9717 SOA ns1.adc.net.ar. adc.net.ar. 2024031301 21600 10800 604800 43200
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0