230.183.243.173.dyn.smithville.net has no NS records.
NS records for this zone are defined at dyn.smithville.net.
NS records for this zone are defined at dyn.smithville.net.
Question and response
Question
dig 230.183.243.173.dyn.smithville.net. NS
Answer
The response has no answer records.
Authority
dyn.smithville.net. 3600 SOA ns1.bluemarble.net. hostmaster.bluemarble.net. 2017011903 7200 3600 1209600 3600
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0