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 143.239.194.IN-ADDR.ARPA is not the root of its zone.
Instead, try zone transfer on 239.194.IN-ADDR.ARPA .
Instead, try zone transfer on 239.194.IN-ADDR.ARPA .