At launch, Kindle 2i was supported in these countries:
http://blogkindle.com/2009/10/intern...e-of-kindle-2/
Things have changed since, usually for the better. (canada is now supported, more or less.

)
If you know the specific country, there is a link to check for support at:
http://www.amazon.com/gp/product/B00...SIN=B0015T963C