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 4gb0s1etefeb6nn0skot9o3lg2id7o6o.resennet.dk is not the root of its zone.
Instead, try zone transfer on resennet.dk .
Instead, try zone transfer on resennet.dk .