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 www.hosteurope.de.sni-only.edgekey.net is not the root of its zone.
Instead, try zone transfer on dsca.akamaiedge.net .
Instead, try zone transfer on dsca.akamaiedge.net .