Are you using a netmask other than 255.255.255.0? If so, Java's mediocre IP implementation doesn't provide a method of retrieving actual netmasks and jEmplode just hopes that it's 255.255.255.0, IIRC.

I guess they needed to support things other than just platforms with BSD sockets... but even then, I suppose there are different variants of those ioctls, and some require superpowers on some platforms.

Bleah.