The American Registry for Internet Numbers (ARIN) warns that it will be unable to fulfill a request for the allocation of a large block of IPv4 addresses due to depletion of the available address pool. This is a first for the registry, which is changing its allocation policy in response to the event. Organizations requesting large address blocks may have to settle for smaller allocations instead—or join a waiting list with no promise of fulfillment.
The global supply of IPv4 addresses has long been in peril. Other registries around the globe have all issued similar announcements in the past. ARIN states that IPv4 addresses are still available, but as their IPv4 countdown page shows, only /23 and /24 blocks remain. Of course, where there's scarcity, there's a business opportunity—the IPv4 address market is a real thing now. Organizations are paying substantial sums to get ahold of these 32-bit numbers.
ARIN encourages organizations to consider using IPv6 instead of IPv4 for their public-facing network services, as the supply of those addresses is plentiful and isn't likely to run out in the foreseeable future of humanity. (And yes, The Tech Report is reachable via IPv6.)