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2005 IPv4 Address Use Report
From: Iljitsch van Beijnum <iljitsch () muada com>
Date: Sun, 1 Jan 2006 20:57:38 +0100


According to AfriNIC, APNIC, ARIN, LACNIC and RIPE NCC statistics as published on their respective FTP servers, they gave out 165.45 million IPv4 addresses in 2005. Out of 3706.65 million usable IPv4 addresses, 1468.61 million are still available as of januari 1, 2006.

Breakdown by Regional Internet Registry over the past few years:

                2000    2001    2002    2003    2004    2005

AfriNIC         0.56    0.38    0.25    0.21    0.51    1.89
APNIC          21.08   28.84   27.08   33.08   42.92   53.97
ARIN           30.96   32.76   21.02   22.14   33.51   36.30
LACNIC          0.88    1.57    0.65    2.62    3.77   11.04
RIPE NCC       24.88   25.39   19.94   29.72   47.75   62.25

Total          78.35   88.95   68.93   87.77  128.45  165.45

AfriNIC gives out address space in Africa, APNIC in the Asia-Pacific region, ARIN in North America, LACNIC in Latin American and the Caribbean and the RIPE NCC in Europe, the former Soviet Union and the Middle East.

Note that the RIRs tend to change their records retroactively from time to time. For instance, the januari 1, 2005 records show that only 117.3 million addresses were given out in 2004. Also, reclaimed address space isn't listed explicitly. From the fact that the 1-1-2005 records show 1939 million addresses given out before 2004 but the 1-1-2006 records show 1928.48 million addresses for the same period, we can conclude that 11.15 million addresses given out before 2004 have been reclaimed in 2005.

The Internet Assigned Numbers Authority (IANA, part of ICANN) keeps an overview of the IPv4 address space at http://www.iana.org/ assignments/ipv4-address-space. The list consists of 256 blocks of 16.78 million addresses. Breakdown:

Delegated to   Blocks   Addresses (millions)

AfriNIC             1       16.78
APNIC              16      268.44
ARIN               23      385.88
LACNIC              4       67.11
RIPE NCC           19      318.77
Various            50      838.86
End-user           43      721.42
Available          65     1090.52

Of the 1895.83 million addresses delegated to the five Regional Internet Registries, 1517.74 million have been delegated to end-users or ISPs by the RIRs, and 378.09 million are still available. Along with the 1090.52 million addresses still available in the IANA global pool this makes the total number of available addresses 1468.61 million.

The size of address blocks given follows an interesting trend. The table below shows the number of requests for a certain range of block sizes (equal or higher than the first, lower than the second value).

                2000    2001    2002    2003    2004    2005

< 1000           326     474     547     745    1022    1309
1000 - 8000      652    1176     897    1009    1516    1891
8000 - 64k      1440     868     822    1014    1100    1039
64k - 500k       354     262     163     215     404     309
500k - 2M         19      39      29      46      61      60
> 2M               3       5       5       6       7      18

The number of blocks in the two smallest categories have increased rapidly, but not as fast as the number of blocks in the largest category, in relative numbers at least. However, the increase in large blocks has a very dramatic effect while the small blocks are insignificant, when looking at the millions of addresses involved:

                2000    2001    2002    2003    2004    2005

< 1000          0.10    0.16    0.18    0.25    0.35    0.44
1000 - 8000     2.42    4.47    3.23    3.45    4.49    5.07
8000 - 64k     18.79   12.81   11.35   14.00   15.99   15.46
64k - 500k     35.98   32.19   20.28   25.51   42.01   34.23
500k - 2M      12.68   24.64   21.30   31.98   44.63   41.63
> 2M            8.39   14.68   12.58   12.58   20.97   68.62

The medium-sized blocks seem most affected by the burst of the internet bubble.

Another way to look at the same data:

Year    Blocks    Addresses (M)   Average block size

2000      2794            78.35                28043
2001      2824            88.95                31497
2002      2463            68.93                27985
2003      3035            87.77                28921
2004      4110           128.45                31252
2005      4626           165.45                35765

The 2222.38 million addresses currently in use aren't very evenly distributed over the countries in the world. The current top 15 is:

Country   Addresses

  US      1324.93 M            United States
  JP       143.00 M            Japan
  EU       113.87 M            Multi-country in Europe
  CN        74.39 M            China
  CA        67.43 M            Canada
  DE        51.13 M            Germany
  FR        45.16 M            France
  KR        41.91 M            Korea
  UK        40.18 M            United Kingdom
  GB        33.63 M            Great Britain
  AU        26.87 M            Australia
  IT        18.39 M            Italy
  BR        17.17 M            Brazil
  NL        16.40 M            Netherlands
  ES        16.29 M            Spain

The US holds 60% of the IPv4 address space. The other countries in the list together hold another 32%.

A copy of this information and a tool to perform queries on the base data is available at http://www.bgpexpert.com/addrspace2005.php


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