Provider-aggregatable address space

{{Short description|IP address block for route aggregation}}

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.{{cite web |title=What are Provider Aggregatable (PA) addresses and Provider Independent (PI) addresses? |url=https://www.ripe.net/participate/member-support/faqs/isp-related-questions/pa-pi |website=RIPE Network Coordination Centre |publisher=RIPE NCC |access-date=7 December 2023}}

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.