So that I don't have to keep replying to this off list: On Wed, Jan 08, 2014 at 01:07:12PM -0800, manning bill wrote: > There can be/ have been multiple roots in the DNS - HOWEVER, there is a always a single root _per class_. > One root for IN, one root for CH, one for HS, etc… Right. Except it turns out that CNAME and DNAME are specified in terms of names and not name+class, so at the very least the class boundaries are not as clean as we would like. As you note, in any case, all anyone uses is IN. Best, A -- Andrew Sullivan ajs@xxxxxxxxxxxxxxxxxx