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 hl5pkt66rh7snlkj260kteim2d1o2o02.boerneloppen.dk is not the root of its zone.
Instead, try zone transfer on boerneloppen.dk .
Instead, try zone transfer on boerneloppen.dk .