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 h101-44-4-185.rev.hosting.nbs-system.com is not the root of its zone.
Instead, try zone transfer on rev.hosting.nbs-system.com .
Instead, try zone transfer on rev.hosting.nbs-system.com .