ns4.ispnet.net has no NS records.
NS records for this zone are defined at ispnet.net.
NS records for this zone are defined at ispnet.net.
Question and response
Question
dig ns4.ispnet.net. NS
Answer
The response has no answer records.
Authority
ispnet.net. 86400 SOA localhost.ispnet.net. hostmaster.ispnet.net. 2026022101 7200 3600 1209600 86400
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0