user659: 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.

user575: There is a list here, and a more detailed one here. 3 is indeed for a Bitcoin script hash.

659: <p>I know Bitcoin addresses start with <code>1</code>, and it seems that testnet addresses start with <code>m</code> or <code>n</code>, and Namecoin addresses start with <code>N</code>, 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.</p>

<p>I specifically want to know what these addresses are for (they're embedded in the executable linked to in <a href="https://bitcoin.stackexchange.com/q/2778/659">this question</a>):</p>

<pre><code>3Q9yidc7Sqwj4fkFmomzC4fqyFzNGTA21x
3Nw1sp46VjHyVDDAaQhDHZSX4xvoqNzrBs
3NjPgjfMAAbamPE5PcgvXHSkCzq4kqijpH
</code></pre>

<p>but a complete list associating address prefixes with coin types would be more useful.</p>
 575: <p>There is a list <a href="https://en.bitcoin.it/wiki/Base58Check_encoding#Version_bytes" rel="nofollow">here</a>, and a more detailed one <a href="https://en.bitcoin.it/wiki/List_of_address_prefixes" rel="nofollow">here</a>. 3 is indeed for a Bitcoin script hash.</p>
