Global IPv6 Deployment
30.2%

500 sites tested
0 DNS errors
151 with IPv6

China
11.6%

500 sites tested
0 DNS errors
58 with IPv6

Germany
18.2%

500 sites tested
0 DNS errors
91 with IPv6

Finland
18.6%

500 sites tested
0 DNS errors
93 with IPv6

India
22.6%

500 sites tested
0 DNS errors
113 with IPv6

IETF
18.5%

3083 sites tested
0 DNS errors
570 with IPv6

South Korea
16.4%

500 sites tested
0 DNS errors
82 with IPv6

United Kingdom
16.8%

500 sites tested
0 DNS errors
84 with IPv6

United States
16.2%

500 sites tested
0 DNS errors
81 with IPv6

What do these numbers mean?

This experiment attempts to answer the following question: If an average user had a working installation of IPv6 on their machine, how useful would it be to them? What percentage of the services and sites the average user regularly accesses are IPv6-enabled? In other words, the experiment attempts to quantify the usefulness of IPv6 to the average end user, given the current deployment of IPv6 in the Internet.

The experiment does not track how many users or hosts use IPv6 in the current Internet. It also does not track how many sites have configurations of IPv6 that are not accessible by average users from the Internet.

The Internet Protocol version 6 (IPv6) is a network layer protocol for packet-switched internetworks, intended to replace the current IPv4 standards.

The IETF statistics are based on a list of domain names that are derived from the email addresses of currently-active document authors of Internet Engineering Task Force (IETF) documents. This data set was included to investigate if the organizations that IETF authors come from are more progressive in deploying IPv6, compared to the rest of the Internet.

How are these numbers generated?

The scripts that update this page retrieve the names of the web sites that are most popular across the globe, as well as in select countries, from alexa.com in regular intervals. They then check whether the DNS entry for each site name reflects that it uses IPv6. The numbers above show the percentage of these top sites that are IPv6-enabled, as well as the absolute numbers.

Note that although the DNS entry for a site may indicate that IPv6 is available, this does not necessarily mean that actually using IPv6 with the site will succeed. I’ll eventually add code to verify that IPv6 can be used with sites that claim to enable it.

How representative are these numbers?

They’re reasonably representative, but not perfect. One issue is that the sample sets are very small; alexa.com typically offers lists of 100 to 500 top sites for free, depending on the country. More importantly, though, the sample sets are derived from web site names, because that’s all alexa.com offers. It is not clear that checking IPv6 deployment based on a set of web site names is resulting in numbers that represent deployment of IPv6 in the broader Internet.

Attention, operators: I’m interested in basing these statistics on a more meaningful data set. If you can provide me with a regularly-updated list of most-frequently-looked-up DNS names – or, for SPF or DKIM, a list of the domains that generate the most inbound email – please contact me at please enable javascript to view . The larger your network and the longer the list, the better.

How have these numbers been changing over time?

Funny you should ask. The graphs below (click on each image to get a PDF that lets you zoom in) illustrate the weekly changes of IPv6 deployment in the various sample sets since these measurements started in October 2007:

IPv6 deployment trends - click to zoom in (PDF)

This graph shows the same data as the one above, but zooms in on the interesting area:

IPv6 deployment trends (magnified) - click to zoom in (PDF)

Significant jumps in the historic data (e.g., fall 2008 or spring 2009) are usually due to alexa.com changing what data they make available, or on tracking bugs having been fixed. The latter fixes are often based on suggestions of visitors to this page. See the acknowledgements below.

Download deployment trends as text: global cn de fi in jp kr uk us ietf

Acknowledgements and Changes