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Anyone know of a decent, free, subnet calculator for the BB?

I don't do much day-to-day networking work anymore, so my instant recall and calculations (especially when doing variable subnetting) can be interesting, to say the least. I was at a friends colo the other night implementing an ASA to sit in front of his webserver, and screwed up a netmask. Since I was looking for a "big" problem, it took me almost 45 mins to realize where I screwed up. Something like this would be very helpful, and also help me maintain my 'geek cred' as the ascent up the corporate ladder gets me more and more removed from the fun stuff :( Anyone who says that budgeting and overseeing people/resources is more fun than an all nighter fixing BGP routes is a da*n fool!