[ (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: Delegated Blocks +/- 2009 Addresses Used Available to/status (in millions) AfriNIC 2 33.55 14.89 18.66 APNIC 34 +4 570.42 540.36 30.06 ARIN 31 520.09 486.58 33.51 LACNIC 6 100.66 79.77 20.89 RIPE NCC 30 +4 503.32 450.11 53.21 RIRs subtotal 103 +8 1728.05 1571.71 156.34 LEGACY 92 1543.50 1413.88 129.62 UNALLOCATED 26 -8 436.21 436.21 Totals 221 3707.76 2985.59 722.17 The RIRs requested an unusually small number of /8s from IANA: only eight. As a result, APNIC is well below the nine months working inventory threshold, so it should be getting no less than six additional /8s soon to get back to 18 months working inventory. Similarly, ARIN should be getting five additional /8s soon. This would bring us to 15 /8s remaining in the IANA global pool, and should allow for regular operation for about the rest of the year. Then in early 2011, the next round of delegations will have to happen, which may or may not hit the magic fifth-to-last /8, after which the remaining four will be given to the other four RIRs and then each RIR will run out of IPv4 space at its own pace. The total number of available addresses is slightly higher than the previously mentioned figure at 3707.76 million because the table above includes 172.16.0.0/12 and 192.168.0.0/16, which are set aside for private use. Networks 0.0.0.0/8 and 127.0.0.0/8 aren't usable because of special uses and 10.0.0.0/8 is also set aside for private use. 224 - 239 are multicast addresses, and 240 - 255 is class E, which is "reserved for future use". The 2985 million addresses currently in use aren't very evenly distributed over the countries in the world. The current top 15 is: 2010-01-01 2009-01-01 increase Country 1 - US 1495.13 M 1458.21 M 2.3% United States 2 - CN 232.45 M 181.80 M 27.9% China 3 - JP 177.15 M 151.56 M 16.9% Japan 4 - EU 149.48 M 120.29 M 24.3% Multi-country in Europe 5 (6) DE 86.51 M 81.75 M 5.8% Germany 6 (9) KR 77.77 M 66.82 M 16.4% Korea 7 - CA 76.96 M 74.49 M 3.3% Canada 8 - FR 75.54 M 68.04 M 11.0% France 9 (5) GB 74.18 M 86.31 M -14.1% United Kingdom 10 - AU 39.77 M 36.26 M 9.7% Australia 11 - BR 33.95 M 29.75 M 14.1% Brazil 12 - IT 33.50 M 29.64 M 13.0% Italy 13 (14) RU 28.47 M 23.18 M 22.8% Russia 14 (13) TW 27.10 M 24.01 M 12.9% Taiwan 15 (17) NL 22.84 M 21.67 M 5.4% Netherlands The reduction in address use by the UK is because net 51.0.0.0/8 is now registered as country "EU" rather than "GB". In 2008, the United States was the biggest user of new address space with 50 million new addresses put into use. China was second with 46.50 million. In 2009, they swapped places: China used up 50.65 million addresses and the US a mere 36.92 million. The US now holds 50.1% of the IPv4 address space in use, down from 52.4% last year. The total for the top 15 excluding the US is now 38%, up from 35.8%. The rest of the world gets the remaining 12%, up from 11.8%. The size of address blocks given out was increasing until 2005, and then started decreasing. The table below shows the number of delegations for a certain range of block sizes (equal or higher than the first, lower than the second value). 2003 2004 2005 2006 2007 2008 2009 < 1000 745 1022 1309 1507 1830 1896 1747 1000 - 8000 1009 1516 1891 2265 2839 3235 3185 8000 - 64k 1014 1100 1039 1192 1015 1129 1169 64k - 500k 215 404 309 419 395 410 403 500k - 2M 46 61 60 57 62 82 70

2M 6 7 18 17 24 18 21

In millions of addresses: 2003 2004 2005 2006 2007 2008 2009 < 1000 0.25 0.35 0.44 0.51 0.63 0.65 0.59 1000 - 8000 3.45 4.49 5.07 5.83 6.93 7.75 7.55 8000 - 64k 14.00 15.99 15.46 18.01 15.67 17.40 18.01 64k - 500k 25.51 42.01 34.23 50.86 50.83 52.58 50.50 500k - 2M 31.98 44.63 41.63 46.69 45.50 57.41 49.28

2M 12.58 20.97 68.62 52.43 67.37 54.00 54.12

Numbers of delegations and their average size: 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 2006 5457 174.32 31945 2007 6165 186.92 30320 2008 6770 189.79 28035 2009 6595 180.06 27302 (The numbers of addresses given out are lower here because ARIN often attributes the delegation of new addresses to a previous year, this view doesn't correct for that.)