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 er5gke00194uq8f0a30qh3ihpg5m1sg1.webexchange.nu is not the root of its zone.
Instead, try zone transfer on webexchange.nu .
Instead, try zone transfer on webexchange.nu .