ns6-01-lhr.uk.transmissionco.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 ns6-01-lhr.uk.transmissionco.net is not the root of its zone.
Instead, try zone transfer on transmissionco.net .