A single user has at least a /64 (which in IPv6 must correspond to a subnet). This is the equivalent of a NATted IPv4 address for privacy purposes. Often, in o

A single user has at least a /64 (which in IPv6 must correspond to a subnet). This is the equivalent of a NATted IPv4 address for privacy purposes. Often, in order to allow customers to use multiple subnets, ISPs will allocate a /56 (256 subnets) to customers. For privacy purposes these have the same behavior as IPv4 addresses, in that they in theory can be rotated between users but in practice have lifetimes on the order of months.