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 _dc-mx.9241512460f5.comunicacionintegral.edu.do is not the root of its zone.
Instead, try zone transfer on comunicacionintegral.edu.do .
Instead, try zone transfer on comunicacionintegral.edu.do .