The IPv4 transfer market

The pool of free IPv4 addresses ran dry years ago — the RIRs handed out the last large blocks between 2011 and 2019. Since then, address space changes hands through a secondary market: organisations that hold more than they use sell to those that need more. Every transfer is logged by the Regional Internet Registries, and those logs are what you see here. (IPv6, with its vast supply, has almost no such market; mergers and reorganisations are excluded from the flows below.)