IPv4 exhaustion

Name: IPv4 Address Exhaustion Tracker
License: https://creativecommons.org/licenses/by/4.0/

The 32-bit IPv4 address space has a hard ceiling of 4,294,967,296 addresses. IANA allocated its last unreserved /8 on February 3, 2011.

85.85%

of IPv4 space allocated

Allocated

3,687.38M

3,687,380,015

Unallocated / reserved

607.59M

607,587,281

Total IPv4

4,294.97M

2³²

By Regional Internet Registry

RIR	IPs managed	Share of allocated	Prefixes
ARIN	1,645.50M	44.6%	224,164
APNIC	889.49M	24.1%	60,585
RIPE	854.19M	23.2%	250,685
LACNIC	181.93M	4.9%	14,487
AFRINIC	116.17M	3.2%	15,005

1981 — IPv4 defined in RFC 791.
1993 — Classful addressing replaced with CIDR (RFC 1519) to slow exhaustion.
Feb 2011 — IANA allocates the last /8 to APNIC. Top-level free pool exhausted.
Apr 2011 — APNIC enters "last /8" policy (1 /22 per LIR).
Sep 2012 — RIPE NCC enters last /8 policy.
Jun 2014 — LACNIC free pool exhausted.
Sep 2015 — ARIN free pool exhausted.
Nov 2019 — RIPE NCC runs out (single /22 allocations only from waitlist).
Ongoing — All new allocations come from returns, transfers, or waitlists. Secondary market prices ~$25–50/IP.