One word-
IPPLAN.
It's on sourceforge and it rocks. I manage about 40 Class C blocks for client assignment, mostly all subnetted as well, and IPPLAN works wonders. It will change your life!!!! Just kidding, but it's pretty darn cool. It's a php/mysql webapp.
Before that, as mentioned above, I worked with a spreadsheet. The problem with a spreadsheet comes when more than one person is putting their hand in the cookie jar (and at the same time.)
BTW, you should post questions like this elsewhere on this site... only because I was trolling outside my normal haunts (I'm an OBSD user) did I notice this question.
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Network Firefighter
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