DNS4.nipr.mil has no NS records.
NS records for this zone are defined at nipr.mil.
NS records for this zone are defined at nipr.mil.
Question and response
Question
dig DNS4.nipr.mil. NS
Answer
The response has no answer records.
Authority
nipr.mil. 3600 SOA dns1.nipr.mil. hostmaster\@nic.mil. 37947 21600 3600 2419200 3600
Additional
. 0 OPT ; payload 4096, xrcode 0, version 0, flags 0