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 host7.181-9-214.telecom.net.ar is not the root of its zone.
Instead, try zone transfer on 181-9-214.telecom.net.ar .
Instead, try zone transfer on 181-9-214.telecom.net.ar .