Summary
There certainly are some interesting rules to get used to, which is why it continues to be one of the most confusing subjects for entry-level network engineers and administrators. The reasons a specific address range is assigned may not overly useful to the majority of people who will never be interested or involved with the assignment of IPv6 addresses from the perspective of an RIR or an ISP. But for those network engineers that need to work at levels higher up the IPv6 assignment chain, it is vitally important to have a good understanding of the concepts covered in this article as well as a good handle on all the various IPv6 proposals and standards that often change from month to month. You should now understand two of the most commonly used IPv6 ranges and applications, and how they can be used to calculate IPv6 addressing ranges.