Reviewer: David Blacka Review Result: Ready with Nits Hi, I'm the designated DNS Directorate (dnsdir) reviewer for this document. Overall, I think this draft is in pretty good shape. I have a nit and a few overall comments. First, a small typo that could be fixed. In section 7, > As catalog zones are transmitted using DNS zone transfers, it is RECOMMENDED that catalog zone transfer are protected from unexpected modifications by way of authentication, should be: > As catalog zones are transmitted using DNS zone transfers, it is RECOMMENDED that catalog zone transfers are protected from unexpected modifications by way of authentication, That is, "transfer" should be "transfers". Second, some comments: This draft is not quite definitive on whether or not Catalog Zones are directly queryable. Instead, it strongly discourages them from being queried, but usually using non-normative language. (The exception: the security considerations RECOMMEND limiting who can query the zone.) I wonder if the document would be better served with a more up-front statement on this issue? An appendix showing a full example catalog zone would be a nice addition to the document. There are examples throughout the text demonstrating specific concepts, however, so it isn't clear that such an appendix is strictly necessary. Catalog zones appear to be intentionally not fully interoperable between completely un-coordinated instances. Is this interpretation correct? I think my basic confusion arises from not seeing what can be done with catalog zones *without* custom properties.