2a02-a46f-95b7--1.fixed6.kpn.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 2a02-a46f-95b7--1.fixed6.kpn.net is not the root of its zone.
Instead, try zone transfer on fixed6.kpn.net .