All of our internal production sites starting in 2009 have been launched with dual stack IPv4/IPv6 from day one.  We typically serve static assets (images and javascript) from our content delivery network to improve load performance.  Unfortunately, the CDN we use is IPv4 only. The following Ruby on Rails code snippet is from /config/environments/production.rb that [...]

The launch of Pay4Bugs was unique not only because it is one of the first real products launched from day one with dual stack IPv4/IPv6 access, but also because Pay4Bugs, along with its sister IPv6-enabled OpenID provider, 87id,  is the first site to make possible OpenID sign on using exclusively IPv6 in a production environment.  [...]