mx.wpkrecords.com has no NS records.
NS records for this zone are defined at wpkrecords.com.
NS records for this zone are defined at wpkrecords.com.
Question and response
Question
dig mx.wpkrecords.com. NS
Answer
The response has no answer records.
Authority
wpkrecords.com. 3600 SOA dns.wpkrecords.com. hostmaster.wpkrecords.com. 1779727353 43200 3600 604800 3600
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0