Is there a good flag icon pack that corresponds to ISO-3166 Country Codes?

Hubro picture Hubro · Mar 1, 2012 · Viewed 46k times · Source

I'm in need of an icon pack containing flags that correspond with ISO-3166 country codes such as US, CA, SE, DE etc. Optimally the flag icons would have names such as us.png, ca.png and so on. I'm guessing this is a common developer necessity making this a great place to ask.