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This answer worked. I needed to put this line of code first in my main method:

System.setProperty("java.net.preferIPv4Stack","true");

I don't know why putting it on the command line didn't...

Oops. Can't figure out how to edit a post, so here's a correction to one of the URLs:
http://stackoverflow.com/questions/9299566/java-windows-7-reliably-getting-ipv4-netmask

Yeah, sorry about that. I didn't before know the rule about cross-posting. Here's the complete list:
http://stackoverflow.com/questions/9299566/java-wi...-reliably-getting-ipv4-netmask ...

I've run into a known bug with Java 6 on Windows. My understanding is that the normal way to get the netmask is to look up the network prefix length and do some bit shifts. The problem is that on...