IANA allocates recovered IPv4 addresses to RIRs
The five Regional Internet Registries (RIRs) have each been allocated the equivalent of a /20 of IPv4 address space from the Internet Assigned Numbers Authority (IANA). These allocations have been made from IANA’s recovered IPv4 pool, in line with a global policy adopted in May 2012. The recovered IPv4 pool which contains fragments left over in the IANA inventory after the last /8s of the IPv4 space are delegated to the RIRs, and IPv4 addresses returned to IANA by any means.
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