dns.sporbust.com has no NS records.
NS records for this zone are defined at sporbust.com.
NS records for this zone are defined at sporbust.com.
Question and response
Question
dig dns.sporbust.com. NS
Answer
The response has no answer records.
Authority
sporbust.com. 3600 SOA dns.sporbust.com. hostmaster.sporbust.com. 1465839724 43200 3600 604800 3600
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0