not to be flip, but the answer to your question depends
on what you mean by: "Red Hat Linux"
with end-user or enterprise support or without support
(other than community support)?
If you're inquiring about the end-user product with no support which began
with (what?) Red Hat 4.X (was there an earlier "named" version?) and ended
with Red Hat 9.0, then [size:4]
read this[/color] and then visit the [size:4]
Fedora[/color] Project site.
In other words, there are post-9.0 versions of Red Hat Linux.
They're just not called "Red Hat X.X" any more.