A provider-independent address space is a block of IP addresses assigned by a regional Internet registry (RIR) directly to an end-user organization. The user must contract with an Internet service provider to obtain routing of the address block within the Internet.
Provider-independent addresses offer end-users the opportunity to change service providers without renumbering of their networks and to use multiple access providers in a multi-homed configuration. However, provider-independent blocks may increase the burden on global routers, as the opportunity for efficient route aggregation through Classless Inter-Domain Routing (CIDR) may not exist.
Read more about Provider-independent Address Space: IPv6 Assignments, See Also
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