The term global routing prefix refers to the idea that routers can have one route that covers all the addresses inside an address block, without the need to have individual routes for smaller portions of that block. All IPv6 addresses in a company should begin with the global routing prefix assigned to it. IPv6 has plenty of space to allow all companies to have a global routing prefix with plenty of addresses, thanks to its 128-bit address size.
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Global unicast addresses make up the majority of IPv6 address space.