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 [...]

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