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 80i1lt179c7k26pngh16e5tmmfko03it.boerneloppen.dk is not the root of its zone.
Instead, try zone transfer on boerneloppen.dk .
Instead, try zone transfer on boerneloppen.dk .