IPv4 Address Report

This report generated at 09-Oct-2015 08:24 UTC.

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IANA Unallocated Address Pool Exhaustion:
		03-Feb-2011
Projected RIR Address Pool Exhaustion Dates:
	RIR	Projected Exhaustion Date	Remaining Addresses in RIR Pool (/8s)
	APNIC:	19-Apr-2011 (actual)	0.6535
	RIPE NCC:	14-Sep-2012 (actual)	0.9792
	LACNIC:	10-Jun-2014 (actual)	0.1373
	ARIN:	24 Sep-2015 (actual)
	AFRINIC:	23-Apr-2019	2.3073

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        Projection of consumption of Remaining RIR Address Pools

 

        Variance of Projections of Remaining RIR Address Pools

 

        Cumulative Probability of Projections of Remaining RIR Address Pools

  Notes:

"Exhaustion" is defined here as the time when the pool of available addresses in each RIR reaches the threshold of no more general use allocations of IPv4 addresses. As ARIN have already reserved a /10 for the transition to Ipv6 policy, the low point for ARIN is a completely depleted general use pool. For AFRINIC and LACNIC it the threshold is a total of a /11 remaining in their available address pool. This calculation also takes into account the redistribution of the IANA Global Address pool, and in the simulation of exhaustion these addresses are redistributed to the RIRs according to the policy.

Current Status

The IPv4 address space is a 32 bit field. There are 4,294,967,296 unique values, considered in this context as a sequence of 256 "/8s", where each "/8" corresponds to 16,777,216 unique address values.
As noted in RFC 5735 a number of address blocks are 'reserved.' There are a total of the equivalent of 35.078 /8 address blocks that are 'reserved'. (This is composed of 16 /8 blocks reserved for use in multicast scenarios, 16 /8 blocks reserved for some unspecified future use, a /8 (0.0.0.0/8) for local identification, a /8 for loopback (127.0.0.0/8), and a /8 reserved for private use (10.0.0.0/8). Smaller address blocks are also reserved for other special uses.)
The remaining 220.922 /8 address blocks are available for use in the public IPv4 Internet. The current status of the total IPv4 address space is indicated in Figure 1.
 

        Figure 1 - Address Pool Status

 
This allocated number pool is managed by the Regional Internet Registries, (RIRs) and the breakdown of IANA allocated address blocks to each of the RIRs is shown in Figure 2.

        Figure 2 - Address allocations to RIRs

Any individual IPv4 address can be in any one of five states:

• reserved for special use, or
• part of the IANA unallocated address pool,
• part of the unassigned pool held by an RIR,
• assigned to an end user entity but not advertised in the routing system, or
• assigned and advertised in BGP.

The current totals of IP addresses according to this set of states is shown in Figure 3.


 

        Figure 3 - Address Pools by State

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