ns2.udnemy.com has no NS records.
NS records for this zone are defined at udnemy.com.
NS records for this zone are defined at udnemy.com.
Question and response
Question
dig ns2.udnemy.com. NS
Answer
The response has no answer records.
Authority
udnemy.com. 3600 SOA dns.udnemy.com. hostmaster.udnemy.com. 1237067736 43200 3600 604800 3601
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0