147-253-208-0.ip.sparkpost.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 147-253-208-0.ip.sparkpost.com is not the root of its zone.
Instead, try zone transfer on sparkpost.com .