iphive is an inventory management system for IPv4 addresses.
Consider a network with more than one /24 IP block present, and a need to divide that into smaller blocks for allocating to for arbitrary uses. In our use case we will assume that you want to divide that /24 into /29 blocks. Obviously being able to track which of those /29 blocks are in use and what they are being used for is helpful. This system allows you to do this.
iphive uses a mysql database to keep track of the supernets, blocks, and addresses. The web interface is based on the Mite web framework and also contains an auditing tool meant to be run directly on a command line. The auditing tool uses SNMP queries against a user-defined set of routers to check for routes and confirm IP usage on a network and the blocks sizes actually used.