f6c744c05364e5b7d78d108825462b40.b15f2aa69cccb892bd42f75dc3fe60e5.639b863b0790e.comodoca.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 f6c744c05364e5b7d78d108825462b40.b15f2aa69cccb892bd42f75dc3fe60e5.639b863b0790e.comodoca.com is not the root of its zone.
Instead, try zone transfer on comodoca.com .