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 host-76-9-168-56 is not the root of its zone.
Instead, try zone transfer on host-76-9-168-56. .
Instead, try zone transfer on host-76-9-168-56. .