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 ip-198-205-103-2.phi.h5datacenters.com is not the root of its zone.
Instead, try zone transfer on phi.h5datacenters.com .
Instead, try zone transfer on phi.h5datacenters.com .