bbounce1.vtrnz.com has no NS records.
NS records for this zone are defined at vtrnz.com.
NS records for this zone are defined at vtrnz.com.
Question and response
Question
dig bbounce1.vtrnz.com. NS
Answer
The response has no answer records.
Authority
vtrnz.com. 900 SOA ns1.acoustic-adm.com. awsdns-hostmaster.amazon.com. 1 7200 900 1209600 86400
Additional
. 0 OPT ; payload 4096, xrcode 0, version 0, flags 0