How can I identify the coin type from its address? I know Bitcoin addresses start with 1, and it seems that testnet addresses start with m or n, and Namecoin addresses start with N, but is there a more complete list that would allow me to identify the coin type from an address?  I hope this isn't offtopic, asking about other block chains.

I specifically want to know what these addresses are for (they're embedded in the executable linked to in this question):

3Q9yidc7Sqwj4fkFmomzC4fqyFzNGTA21x
3Nw1sp46VjHyVDDAaQhDHZSX4xvoqNzrBs
3NjPgjfMAAbamPE5PcgvXHSkCzq4kqijpH


but a complete list associating address prefixes with coin types would be more useful.
There is a list here, and a more detailed one here. 3 is indeed for a Bitcoin script hash.