spf.qsl.net.au has no NS records.
NS records for this zone are defined at qsl.net.au.
NS records for this zone are defined at qsl.net.au.
Question and response
Question
dig spf.qsl.net.au. NS
Answer
The response has no answer records.
Authority
qsl.net.au. 3600 SOA ns1.melbourneit.net. admin.melbourneit.net. 2025052702 86400 7200 3600000 172800
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0