_netblocks03.imdlv.net has no NS records.
NS records for this zone are defined at imdlv.net.
NS records for this zone are defined at imdlv.net.
Question and response
Question
dig _netblocks03.imdlv.net. NS
Answer
The response has no answer records.
Authority
imdlv.net. 1799 SOA ns1.digitalocean.com. hostmaster.imdlv.net. 1774743348 10800 3600 604800 1800
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0