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 b.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.1.d.6.0.0.2.1.0.1.0.0.2.6.2.ip6.arpa.iphmx.com is not the root of its zone.
Instead, try zone transfer on iphmx.com .
Instead, try zone transfer on iphmx.com .