spfvb.exetel.com.au has no NS records.
NS records for this zone are defined at exetel.com.au.
NS records for this zone are defined at exetel.com.au.
Question and response
Question
dig spfvb.exetel.com.au. NS
Answer
The response has no answer records.
Authority
exetel.com.au. 900 SOA ns-195.awsdns-24.com. awsdns-hostmaster.amazon.com. 1 7200 900 1209600 86400
Additional
. 0 OPT ; payload 4096, xrcode 0, version 0, flags 0