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 2001-b011-6c08-c968-9209-d0ff-fe29-ab93.dynamic-ip6.hinet.net is not the root of its zone.
Instead, try zone transfer on dynamic-ip6.hinet.net .
Instead, try zone transfer on dynamic-ip6.hinet.net .