smtp.cablevision.com.ar has no NS records.
NS records for this zone are defined at cablevision.com.ar.
NS records for this zone are defined at cablevision.com.ar.
Question and response
Question
dig smtp.cablevision.com.ar. NS
Answer
The response has no answer records.
Authority
cablevision.com.ar. 600 SOA dns1.cvtci.com.ar. noc.fibertel.com.ar. 2025112600 86400 21600 604800 600
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0