> Can anyone say whether existing IP Address Management tools that
> support IPv6 have built-in assumptions or dependencies on the
> /64 subnet prefix length, or whether they simply don't care about
> subnet size?

We use Infoblox's IPAM.  There aren't any limitations of which I'm
aware in terms of allocating space and IPv6 prefix length in the IPAM.
 However, I don't know if there are restrictions when it comes to
DHCPv6, as we've only set up /64s.

mark

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