Attempts of Registration and Allocation
For ULA prefixes, SIXXS is known to maintain a voluntary registration database to reduce the risk of duplicates. As such a database is neither standardized nor mandated, it will reduce the risk of duplicates, but it can never eliminate it altogether.
For the fc00::/8 range, different design decisions have been proposed, trading the non-uniqueness for the requirement that the range be managed by a central allocation authority. However, such attempts at standardizing this range have not resulted in a Request for Comments.
Read more about this topic: Unique Local Address
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