imx2.t3.nz has no NS records.
NS records for this zone are defined at t3.nz.
NS records for this zone are defined at t3.nz.
Question and response
Question
dig imx2.t3.nz. NS
Answer
The response has no answer records.
Authority
t3.nz. 900 SOA ns-599.awsdns-10.net. awsdns-hostmaster.amazon.com. 1 7200 900 1209600 86400
Additional
. 0 OPT ; payload 4096, xrcode 0, version 0, flags 0