2009 IPv4 Address Use Report

Jeroen van Aart jeroen at mompl.net
Tue Mar 23 16:43:45 CDT 2010

Iljitsch van Beijnum wrote:
> [ (Non-cross)posted to NANOG, PPML, RIPE IPv6 wg, Dutch IPv6 TF. Web version for the monospace font impaired and with some links:
> http://www.bgpexpert.com/addrspace2009.php ]
> 2009 IPv4 Address Use Report
> As of January first, 2010, the number of unused IPv4 addresses is 722.18 million. On January 1, 2009, this was 925.58 million. So in 2009, 203.4 million addresses were used up. This is the first time since the introduction of CIDR in 1993 that the number of addresses used in a year has topped 200 million. With 3706.65 million usable addresses, 80.5% of the available IPv4 addresses are now in some kind of use, up from 75.3% a year ago. So the depletion of the IPv4 address reserves is continuing in much the same way as in previous years:
> Date         Addresses free   Used up
> 2006-01-01      1468.61 M
> 2007-01-01      1300.65 M    167.96 M
> 2008-01-01      1122.85 M    177.80 M (with return of 16.78 M to IANA)
> 2009-01-01       925.58 M    197.27 M
> 2010-01-01       722.18 M    203.40 M
> These figures are derived from from the Internet Assigned Numbers Authority's IANA IPv4 Address Space Registry page and the records published on the FTP servers of the five Regional Internet Registries (RIRs): AfriNIC, which gives out address space in Africa, APNIC (Asia-Pacific region), ARIN (North America), LACNIC (Latin American and the Caribbean) and the RIPE NCC (Europe, the former Soviet Union and the Middle East).
> The IANA list shows the status of all 256 blocks of 16777216 addresses identified by the first 8-bit number in the IPv4 address.
> http://www.bgpexpert.com/ianaglobalpool.php is a graphical representation of the IANA global pool (updated weekly). The RIR data indicates how much address space the RIRs have delegated to internet service providers (and sometimes end-users). The changes over the course of 2009 are as follows:

Interesting statistics.

It'd be interesting to know what % of newly assigned addresses are used 
for fraudulent and illegal purposes such as spam and scamming (how soon 
and how frequently will the newly assigned block start 
appearing in block lists and spam reports?).

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