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 2a0a8d80000000000000000000000000.ip6.webhost1.net is not the root of its zone.
Instead, try zone transfer on ip6.webhost1.net .
Instead, try zone transfer on ip6.webhost1.net .