vns1.dagent.com has no NS records.
NS records for this zone are defined at dagent.com.
NS records for this zone are defined at dagent.com.
Question and response
Question
dig vns1.dagent.com. NS
Answer
The response has no answer records.
Authority
dagent.com. 300 SOA ns1.exsbs.net. hostmaster.digitalagent.net. 120 300 300 300 300
Additional
. 0 OPT ; payload 4096, xrcode 0, version 0, flags 0