nat4-vl10-lb7.core.noris.net 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 nat4-vl10-lb7.core.noris.net is not the root of its zone.
Instead, try zone transfer on core.noris.net .