blx-soa-1-vrrp.unimelb.net.au IXFR zone transfer

Changes since SOA version

IXFR is a zone transfer request that returns changes since a specific SOA version. Enter the SOA version to request changes since then.

Not an apex domain The domain blx-soa-1-vrrp.unimelb.net.au is not the root of its zone.
Instead, try zone transfer on unimelb.net.au .