cvdnsisp4.cablevision.net.mx has no NS records.
NS records for this zone are defined at cablevision.net.mx.
NS records for this zone are defined at cablevision.net.mx.
Question and response
Question
dig cvdnsisp4.cablevision.net.mx. NS
Answer
The response has no answer records.
Authority
cablevision.net.mx. 86400 SOA ns02-s01.izzi.mx. fmmartineza.izzi.mx.cablevision.net.mx. 2015073025 21600 900 1209600 86400
Additional
. 0 OPT ; payload 4096, xrcode 0, version 0, flags 0