--On Monday, December 9, 2002 9:48 -0500 Leo Bicknell <email@example.com>
The problem here is that ARIN (and the other registries) are the
ones who can contact the users.
But Michael is not talking about the registries _contacting_ people with a
message about changes in unallocated blocks, he's talking about one
specific regional registry providing a list of all unallocated space (that
still 'belongs' to IANA/ICANN).
The registries already provide notification about new allocations they
receive, though not to individual users.