I just had a fun idea. What if I took the top 1M visited domainnames (according to alexa) and tested them for IPv6 addresses? What percentage would be enabled?
So I pulled the csv file from alexa (http://s3.amazonaws.com/alexa-static/top-1m.csv.zip) and stuffed the domainnames into a mysql database.
Then I wrote a little perlscript using DBI and Net::DNS to test the domain names. Some time after, I got the results:
Number of hostnames tested: 922001
*Number of IPv4-only enabled hostnames:*890933
*Number of IPv4 + IPv6 enabled hostnames:*31047
*Number of IPv6-only enabled hostnames:*21
This means that only 3.3 percent of the top 1M visited domainnames are IPv6 enabled. That's not too good. Of course this result is a bit skewed, since services like google do have IPv6 connectivity, but on seperate domain names. Also, blogspot.com is IPv6 enabled, and hosts a good deal of those sites in the top 1M, 21559 to be exact.
Written by Jannich Brendle tir 18 august 2009 In SEO