Quiz Entry - updated: 2026.07.14
What are the three major issues with IPv4 that drove the development of IPv6?
Address exhaustion (only ~4.3 billion IPv4 addresses), the explosion of Internet-connected devices (IoT), and NAT breaking true end-to-end connectivity.
Three Major IPv4 Issues:
| Issue | Description |
|---|---|
| IPv4 Address Exhaustion | Only ~4.3 billion addresses total; IANA exhausted pool in 2011 |
| Internet of Things (IoT) | Billions of new devices need IP addresses |
| Lack of end-to-end connectivity | NAT breaks true end-to-end communication |
IPv4 Exhaustion Timeline:
- IANA pool exhausted: February 2011
- APNIC (Asia-Pacific): April 2011
- RIPE NCC (Europe): September 2012
- LACNIC (Latin America): June 2014
- ARIN (North America): September 2015
Context: IPv6 provides 340 undecillion addresses (3.4 × 10^38) compared to IPv4's 4.3 billion - enough for every grain of sand on Earth to have billions of addresses.
Go deeper:
IPv4 address exhaustion (Wikipedia) — the depletion story with the exact IANA (2011) and per-RIR exhaustion dates.- IPv6 (Wikipedia) — why the IETF designed a 128-bit successor and what else it fixes beyond address space.