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 host43.201-252-28.telecom.net.ar is not the root of its zone.
Instead, try zone transfer on 201-252-28.telecom.net.ar .
Instead, try zone transfer on 201-252-28.telecom.net.ar .