dns2.cvtci.com.ar has no NS records.
NS records for this zone are defined at cvtci.com.ar.
NS records for this zone are defined at cvtci.com.ar.
Question and response
Question
dig dns2.cvtci.com.ar. NS
Answer
The response has no answer records.
Authority
cvtci.com.ar. 600 SOA dns1.cvtci.com.ar. noc.fibertel.com.ar. 2025111806 86400 21600 604800 600
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0