Joi Ito's Web

Joi Ito's conversation with the living web.

Ray Plzak of ARIN pointed out during the board meeting that 45% of available addresses have been allocated to the RIR's (Regional Internet Registries). There are number of studies about how much longer we have before we run out of addresses. The estimates range from 10 years to 40 years of time left.

I'll write more about this later, but IPv6 seems to be moving forward, but the efficient reallocation of addresses and unanticipated technologies such as NATs (Network Address Translation) has taken the pressure off of IPv6 adoption from the "running out of addresses" perspective. However, IPv6 has many benefits, not just increased address space and we should move forward with adoption. I would also like to point out that the rumor that a single US university has more addresses than China is an urban myth. This was true in the past, but many universities and early Internet address users with large allocations have returned their address space and China has one of the largest address allocations today.

UPDATE: Hmm... This report seems to suggest that the allocation is a bit higher. Maybe I misheard. It appears that 45% of the addresses have NOT been assigned to the RIR's.


I'd note that MIT still have 18/8 - i.e. an allocation of over 16 million addresses. While that is dwarfed by the 100 million+ addresses allocted by APNIC to China (by my rough estimate), I'm sure that's going to be more than a few other countries.

Here is the latest routing table info published by Philip Smith

Number of addresses announced to Internet: 1212269440
Equivalent to 72 /8s, 65 /16s and 195 /24s
Percentage of available address space announced: 32.7
Percentage of allocated address space announced: 51.3
Percentage of available address space allocated: 63.7

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Joi Ito, at the ICANN meetings in Brazil, has posted some interesting comments and links regarding the exhaustion of the IPv4 Space. [here] The growth in private IP Spaces has helped stave off this exhaustion, even through the massive growth in the ... Read More