act-on.net.2.0001.arsmtp.com 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 act-on.net.2.0001.arsmtp.com is not the root of its zone.
Instead, try zone transfer on 0001.arsmtp.com .