outbound45-aus.mail.service-now.com has no NS records.
NS records for this zone are defined at mail.service-now.com.
NS records for this zone are defined at mail.service-now.com.
Question and response
Question
dig outbound45-aus.mail.service-now.com. NS
Answer
The response has no answer records.
Authority
mail.service-now.com. 60 SOA edns140.ultradns.com. root.service-now.com. 37 900 1800 31536000 60
Additional
. 0 OPT ; payload 4096, xrcode 0, version 0, flags 0