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 dynamic-2a02-3102-4d00-3710-021a-4aff-fe16-0153.310.pool.telefonica.de is not the root of its zone.
Instead, try zone transfer on 310.pool.telefonica.de .
Instead, try zone transfer on 310.pool.telefonica.de .