The Asia Pacific Network Information Centre (APNIC) has provided an overview of the pool of allocated but unadvertised Internet protocol version 4 (IPv4) address space. The analysis conducted by the regional Internet registry within its jurisdiction (Asia Pacific) revealed the following: 350 000 unadvertised IPv4 addresses delegated less than five years ago; around 50 million unadvertised IPv4 addresses delegated over five years ago; and around 3.4 million unadvertised and returned historical IPv4 addresses. The potential actions envisioned by the registry with regard to these addresses include returning them to the original pool, transferring them, or having them managed under the APNIC account.