World IPv6 day: another step forward

Arguably one of the single largest changes in the history of the internet comes closer with a succesfull completion of this year’s World IPv6 day.

For more coverage I defer to these two interesting blog posts, each of which has additional links and background. Ars Technica, and Computerworld

Prepare for IPv6 day!

OK, so the end of the world hasn’t happened yet. Trust me, it will, one day.

In the meantime Internettters are preparing for the inevitable demise of IPv4. On June 6 major websites will turn on IPv6, which they have avoided so far in fear of brokenness at clients.

To see how well prepared you are for IPv6 day, have a look at the following sites:

By the way, my IPv6 link is consistently faster than my IPv4 link.

Finally a bit of embedded stuff to automatically give you some IP information.

IPv6 story got picked up by CircleID

Here is the link:

IPv6 penetration crosses 0.2% mark according to Google

According to Google ( native IPv6 penetration has structurally crossed the 0.2% mark as a percentage of total traffic on the Internet in early 2011. This may not seem much, but it has doubled in a year, in an Internet that is still growing exponentially.

Tunneled traffic has decreased, which is good. Yet, it looks like native traffic is only replacing this, not adding to it. This could mean that native IPv6 is only gaining share within a stabilizing population.

Daily variations indicate a bias towards home usage, as percentages are higher on weekends, although this bias has decreased somewhat over the years.

Let us contrast this with the AMS-IX statistics at which appear to be flat line. This is by ethernet type, which is likely to be native IPv6 traffic rather than tunneled. One hypotheses is that IPv6 penetration grows by regions adopting it, other regions would then be catching up to the penetration levels in Europe.

Overall, the message is mixed. IPv6 is growing in maturity, but not necessarily in adoption.

What is your reflection on this?

World IPv6 day #ipv6

For more info look at

On 8 June, 2011, GoogleFacebookYahoo!Akamai and Limelight Networks will be amongst some of the major organisations that will offer their content over IPv6 for a 24-hour “test drive”. The goal of the Test Drive Day is to motivate organizations across the industry – Internet service providers, hardware makers, operating system vendors and web companies – to prepare their services for IPv6 to ensure a successful transition as IPv4 addresses run out.

Never a better day to try out your own IPv6 connectivity as a content provider.

The digital divide on IP addresses – revisited

We are running out of IPv4 Internet addresses, but who is using them all up? The IP address space usage per capita differs greatly between nations, which points to a digital divide.
If we would distribute IPv4 addresses uniformly over the world population, there would be less than 1 address per person. In fact, on the average, 0.54 addresses would be available per person (including all babies, etc). In 2006 this number was 0.57, population has increased in the meantime. The actual use is 0.45 (up from 0.32 in 2006). For a more detailed analysis of this history, see my 2006 analysis at this link.
But addresses are not uniformly distributed. There is a digital divide between western countries and developing countries. The top user (not counting some mini states) is the US, where wasteful pre-CIDR address allocations have led to an average of more than 4 addresses per person. A few dozen countries have more than their fair share (i.e. 0.54) addresses per person, and almost two dozen have more that 1 address per person allocated.
Utilization is still growing rapidly. Over 30, mostly developing, countries have more than doubled their address utilization per capita in the past 4 years. In addition, most developed countries (with the notable exception of the US) have seriously (30-60%) increased their utilizations.
This growth is clearly unsustainable within the IPv4 address space. Not every country can have these utilization levels. The hunger for new addresses is greatest in China (currently at 1 IPv4 address per 4 inhabitants) and India (1 address per 53 inhabitants). To put these at the modest level of 1 address per inhabitant requires more than 2.2 billion addresses, where there are currently only 290 million left, according to Given these numbers and the overall strong growth, any hopes of being able to reuse space that is allocated but not used (i.e. pre-CIDR) are futile. This demand dwarfs the entire US allocation.
IPv6 is supposed to solve the address space problem. Is it progressing? For IPv6 allocations the per capita metric is a bit moot as there is no scarcity. Still, there is an interesting divide. Quite a number of countries have no allocated IPv6 address space at all. A few have pilots, with utilizations less than 1 percent. The largest utilizations are in Sweden and in the Asia Pacific region, where a number of countries have hundreds of IPv6 blocks (/64 each) per inhabitant. The US is in 8th place, after Vietnam and Indonesia but, somewhat surprisingly, before China.
The full data of this analysis can be found in a Google Docs spreadsheet, see
I’d also like to acknowledge Iljitsch van Beijnum who has provided the address allocation data.

IPv6: mission accomplished

I am through with IPv6.

By now all my websites (that I know off) are dual stack with native, untunneled IPv6. Thanks to and (the FritzBox guys) I have native IPv6 in my home office. Setup was a breeze. On my connection scores 10/10 for IPv6 readiness.

I have had a lot to do with the Dutch government. Currently the main site is fully IPv6 capable, and for the internal network the decision to enable IPv6 has been made at the top, and is now trickling down into the it departments. This is going to save them a fortune by reducing NAT (Network Address Translation). I can tell you from first hand experience.

So for now, my mission is accomplished. If you need help rooting out isolated pockets of resistance, give me a call.

App Engine joins the Google over IPv6 Program

Google App Engine Blog: App Engine joins the Google over IPv6 Program

Again promising progress in the IPv6 arena. For you developers out there, this is an opportunity as well as a wake-up call. Be prepared to handle IPv6 traffic.

IPv6 traffic almost tripled last year

IPv6 traffic as a percentage of total traffic at almost tripled from 0.5% to 1.3% of all users of the website. is a security institute. The report analyses the provenance of this traffic (lots of tunnels!) and the security implications of this.

IPv6 awards: 29 entries, nominees chosen

The Dutch IPv6 taskforce is running a contest for best contribution to IPv6.

29 submissions have been received for 6 categories. There are some interesting contestants, amongst them WatchMouse, on which I reported earlier.

See the full press release (in dutch).