tx2.citynet.net has no NS records.
NS records for this zone are defined at citynet.net.
NS records for this zone are defined at citynet.net.
Question and response
Question
dig tx2.citynet.net. NS
Answer
The response has no answer records.
Authority
citynet.net. 600 SOA dns0.citynet.net. hostmaster.citynet.net. 2025101000 36000 3600 86400 600
Additional
. 0 OPT ; payload 4096, xrcode 0, version 0, flags 0