rh4.exsbs.net has no NS records.
NS records for this zone are defined at exsbs.net.
NS records for this zone are defined at exsbs.net.
Question and response
Question
dig rh4.exsbs.net. NS
Answer
The response has no answer records.
Authority
exsbs.net. 43200 SOA ns2.exsbs.net. hostmaster.digitalagent.net. 2005060207 43200 43200 43200 43200
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0