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 poks7tj53rsv31cauurj4l7onr4a5e0s.boerneloppen.dk is not the root of its zone.
Instead, try zone transfer on boerneloppen.dk .
Instead, try zone transfer on boerneloppen.dk .