Translations:Help:Range blocks/IPv6/7/en

In assessing collateral damage it is important to understand IPv6 address allocations to end-users. The most important fact to know about is that single or multiple /64 subnets for an end-user connection is a practical requirement of IPv6. What this means is that IPv6 connections will have at least 264 addresses assigned to them, which is around 18 billion billion; sometimes they can have considerably more. The reason IPv6 requires /64 subnetting is that any deviation from this breaks a great number of IPv6 protocols, and it will also be needed for future developments. The only exception to longer than /64 subnetting is for certain connections where many IPv6 features are not needed, for example a /126 subnet for point-to-point inter-router linking. But this is not relevant for IPv6 rangeblocking since no end-users will have addresses of this sort.