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ICANN has updated the IANA IPv4 Recovered Address Space registry after LACNIC notified it that it has less than a total of a /9 in its inventory of IPv4 address space. This triggered the activation the Recovered IPv4 pool, which was created in the Global Policy for Post Exhaustion IPv4 Allocation Mechanisms by the IANA.
The address space selection is made using software that tries to allocate blocks based on the RIR managing the DNS for that /8. The software, along with a worked example, is published at: https://github.com/icann/
The list of allocations can be found at: https://www.iana.org/assignments/ipv4-recovered-address-space/ipv4-recovered-address-space.xhtml#ipv4-recovered-address-space-2