Local IPv6 Range Generator
The Local IPv6 Range Generator tool can be used to generate global IDs, subnet IDs, and the valid IPv6 range of addresses. Both the global ID and the subnet ID should always be filled in if you are operating on an existing network and existing subnet.
If you are deploying an entirely new network you will need a new global ID and new subnet ID - leave both fields blank and press "Go."
If you are deploying a new subnet to an existing network, fill in the global ID and leave the subnet ID blank.
If you need to generate a new local IPv6 range for an existing subnet, fill in your global ID and subnet ID, and press "Go."
About this Tool
The Local IPv6 Range Generator will generate an 'almost unique' local IPv6 address range, per RFC4193. RFC4193 requires these IPv6 address ranges to be generated using a RFC4086 compliant random number generator. These IPv6 addresses are not expected to be routable on the global Internet.