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Re: IPV4 as a Commodity for Profit

  • From: Iljitsch van Beijnum
  • Date: Fri Feb 22 09:45:06 2008


On 22 feb 2008, at 14:01, <michael.dillon@xxxxxx> <michael.dillon@xxxxxx> wrote:


If one were to sum this up briefly, would it be correct to
answer the MIT myth by saying:

  MIT has only 17 million addresses but China has 140 million.
  Along with Japan at 142 million, these are the top two holders
  of IP addresses with the USA trailing at 48.5 million.

Huh? Where do you get 48.5 million?


Due to
  legacy allocations which are often used wastefully due to legacy
  technology, the USA is often quoted as having 1,411 million IP
  addresses but this does not reflect the current rules under which
  IP address registries operate.

It's possible to identify the legacy /8s (especially now they're called exactly that in the new IANA file) but this is not as easy for the legacy class B space, which is about the same amount of address space. Alternatively, you can simply ignore everything before a certain cutoff date. As of 1994, the RIR system was gaining steam. If we add up all the space given out since 19940101 until now (ignoring what has been returned in the intermediate):


United States                     US       500.595 million
China                             CN       139.853 million
Japan                             JP       101.713 million
United Kingdom                    GB        65.524 million
Germany                           DE        58.945 million

However, there were still a few legacy /8 given out as late as 1998. So looking at everything delegated since 1999:

United States                     US       278.055 million
China                             CN       134.824 million
Japan                             JP        89.883 million
Germany                           DE        53.072 million
South Korea                       KR        51.153 million

So the US has AT LEAST 278 million non-legacy addresses allocated/ assigned. Also, some of the legacy blocks, such as 4/8 and 12/8 are de facto used by ISPs to address customers. Whichever way you slice it, the US is the largest holder of address space by a factor of more than 2, and, until 2007, the largest user of new address space.

(See http://www.bgpexpert.com/addressespercountry.php and http://www.bgpexpert.com/addrspace.php )

In addition, since we are likely
  to use up all possible IPv4 addresses by 2011,

No, that's when the depletion of the IANA pool is predicted. The RIRs also hold 400 million addresses for their day-to-day operations, which will take at least another year, maybe two, to deplete.