blue-origin.loopback1.core1.nyc6.he.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 blue-origin.loopback1.core1.nyc6.he.net is not the root of its zone.
Instead, try zone transfer on he.net .