What is the original range of global unicast IPv6 addresses?

The range of global unicast IPv6 addresses is defined as 2000::/3. This range indicates the beginning portion of the IPv6 address space designated for global unicast routing, meaning that these addresses can be globally routed across the internet. The designation of 2000::/3 signifies that the first three bits are reserved for this type of address, allowing for a structured allocation and efficient routing of IP addresses.

In this case, the range of addresses available under this prefix allows for a vast number of unique addresses, fulfilling the need for extensive address space in the rapidly growing internet infrastructure. This makes global unicast addresses suitable for use by individuals, organizations, and service providers seeking to assign addresses for devices that require direct reachability on the internet.

The other options do not reflect this designated address range. Each of them represents a different allocation of IPv6 addresses that serve other purposes or may not even be valid ranges for global unicast addresses.