ICANN has updated the IANA IPv4 Recovered Address Space registry according to the Global Policy for Post Exhaustion IPv4 Allocation Mechanisms by the IANA. The policy states that in each IPv4 allocation period, each RIR will receive a single IPv4 allocation unit from ICANN. An IPv4 allocation period is defined as a 6-month period following 1 March or 1 September in each year.
The address space selection software can be downloaded from: https://github.com/icann/
The list of allocations can be found at: https://www.iana.org/assignments/ipv4-recovered-address-space/
Selina Harrington IANA Senior Specialist ICANN