Limits RegistryPUBLIC RECORD
Limits RegistryOn February 3, 2011, IANA allocated its last five unassigned IPv4 /8 address blocks — one to each of the five Regional Internet Registries — exhausting the central free pool of unassigned IPv4 address space roughly three decades after IPv4's 1981 standardization. Individual Regional Internet Registries subsequently exhausted their own reserves at different dates in the following years, formally marking IPv4 address scarcity as a permanent operational reality rather than a future risk.
The question, scope, and sources behind this Registry record.
On February 3, 2011, IANA allocated its last five unassigned IPv4 /8 address blocks — one to each of the five Regional Internet Registries — exhausting the central free pool of unassigned IPv4 address space roughly three decades after IPv4's 1981 standardization. Individual Regional Internet Registries subsequently exhausted their own reserves at different dates in the following years, formally marking IPv4 address scarcity as a permanent operational reality rather than a future risk.
The date on which the Internet Assigned Numbers Authority allocated its final five unassigned /8 IPv4 address blocks to the five Regional Internet Registries, exhausting the IANA central free pool of IPv4 addresses.
Change a parameter to stress-test whether a proposed result is still inside the published specification. This is an audit aid, not a proof checker.
This record has no editable parameters. Read the formal question and assumptions before challenging it.
Current frontiers derived from accepted Claims.
An observed or demonstrated result; no opposing bound is implied.
The frontier is not sacred
Most progress starts with a disagreement that survives contact with evidence. If you can push the known lower bound up or pull the upper bound down, show us the work.
≥ when you have shown that at least this value is achievable.≤ when you have shown that anything above this value is impossible.No vibes. State the value, define the scope, and link the paper, proof, code, or reproduction that lets another person check it. Editors review every challenge before the public record changes.
Challenge this recordAssertions tied to evidence, attribution, and review.
The frontier as it changed over time.
Only accepted Claims matching the current specification contribute to the displayed bounds. Strict inequalities remain open; contradictory Claims require editorial review.
1 accepted Claim, with 1 linked evidence records.
Permanent ID limitsregistry.com/limits/LR-IPV4-FREE-POOL-EXHAUSTION
No active verified bounties are linked to this Limit.
View verified bounty tracker ↗No accepted machine-checked reproductions are recorded for this Limit.
Limits Registry. LR-IPV4-FREE-POOL-EXHAUSTION. IANA's central IPv4 address pool exhaustion date. 2026.