ns01.vtr.net has no NS records.
NS records for this zone are defined at vtr.net.
NS records for this zone are defined at vtr.net.
Question and response
Question
dig ns01.vtr.net. NS
Answer
The response has no answer records.
Authority
vtr.net. 300 SOA ns00.vtr.net. hostmaster.vtr.net. 2024030501 10800 3600 604800 38400
Additional
. 0 OPT ; payload 4096, xrcode 0, version 0, flags 0