_dc-mx.e4d92e8716fd.mbig.net. IXFR zone transfer

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.e4d92e8716fd.mbig.net. is not the root of its zone.
Instead, try zone transfer on mbig.net .