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.
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“Bankruptcy is a sacred state, a condition beyond conditions, as theologians might say, and attempts to investigate it are necessarily obscene, like spiritualism. One knows only that he has passed into it and lives beyond us, in a condition not ours.”
—John Updike (b. 1932)