syn-2603-6081-9f00-0219-0000-0000-0000-0a1f.res6.spectrum.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 syn-2603-6081-9f00-0219-0000-0000-0000-0a1f.res6.spectrum.com is not the root of its zone.
Instead, try zone transfer on res6.spectrum.com .