IPv6 block allocation tools
There's much to consider when developing an IPv6 address plan. Such a plan defines how you intend to allocate subnets from the IPv6 block you received from your ISP or Internet Registry. The first step entails defining how much address space is required across and into the depths of your IP network to provide IPv6 address capacity for those devices requiring it. You can use your current IPv4 address allocation database as a guide to define the active utilization of your IPv4 address space and should provide a solid basis for IPv6 capacity needs barring new network initiatives that increase address space usage. Once you've defined where in your network you require IPv6 addresses and how much , you should consider how to perform your allocations. One approach is to simply allocate all required /64 subnets directly from your base ISP allocation, using a monotonic, sparse, best-fit or random allocation approach. This single-tier allocation approach may work fine for small network...