tunnel928367-pt.tunnel.tserv24.sto1.ipv6.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 tunnel928367-pt.tunnel.tserv24.sto1.ipv6.he.net is not the root of its zone.
Instead, try zone transfer on tunnel.tserv24.sto1.ipv6.he.net .