Having had my name on RFC 1918, I think understand some of the issues. There is precisely one that I find at all interesting in this proposal, having stated the concern in RFC 1627:

   * avoiding collisions, and Geoff Huston's math demonstrates the
     likelihood of that happening

But one needn't have reverse lookups delegated in the root to address this concern.

I also understand something about the differences between ULA-C and RFC 1918. For one, this space will be unique within the limits of human error. RFC 1918 not being unique meant that providers really had no choice about blocking it, and IANA had no method to insert reverse addresses to a particular site.

Eliot
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