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Provider-aggregatable address space (PA) is a block of IP addresses assigned by a regional Internet registry to an Internet service provider which can be aggregated into a single route advertisement for improved Internet routing efficiency.

Unlike provider-independent address space, the end-user of address blocks within a provider-supplied space cannot reuse the addresses if they change up-stream connectivity providers.

References

1. "What are Provider Aggregatable (PA) addresses and Provider Independent (PI) addresses?". RIPE Network Coordination Centre. RIPE NCC. Retrieved 7 December 2023.

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