IP Address Management

haggisbrain writes: I'm a Systems Administrator and I've recently started work with a new company where I'm now helping to support a much larger number of nodes that I've previously supported. We have just over 1000 nodes to support but no efficient method to manage the IP addresses and subnets used. Previously an Excel Spreadsheet has been sufficient enough for my needs but now I need to find a new way.

Can someone recommend a piece of software which can help me? Primarily I'm looking for a simple way to list and view the IP addresses used on my network but surely there must be a better solution than using another Excel Spreadsheet?