North American IPv4 Addresses Have Run OutThis article just came across the wire and we wanted to share it with the community.


President and CEO of American Registry for Internet Numbers (ARIN), John Curran, announced the exhaustion of the North American Internet Protocol version 4 (IPv4) pool.


Today, the American Registry for Internet Numbers (ARIN),
the organization responsible for issuing IP addresses in North America,
said that it has run out of freely available IPv4 addresses” – WIRED,
North America Just Ran Out of Old-School Internet Addresses


As we all know, a movement to motivate organizations across the industry to enable and transition to Internet Protocol version 6 (IPv6) has been underway for several years. Sounds like we might be approaching crunch time. As you may know, many countries have already hit this milestone.*


“Technologists have known for years that we would run out of IPv4 addresses, which is why the IPv6 standard was created in the late 1990s. While IPv4 was limited to just about 4 billion addresses, IPv6 will provide 340 undecillion addresses (a one followed by thirty-six zeroes). That’s enough to give 5×1028 addresses to every single person on the planet.” – WIRED


Of course, this means that networking engineers will need to continue to develop their IPv6 addressing knowledge and skills. IPv6 is tested in many Cisco Certification Exams, including the entry level ICND1 exam, CCNP Route Exam, CCIE Routing and Switching and many others.


We thought we would take this opportunity to share some of the IPv6 training resources that we offer on the Cisco Learning Network.


*See reference -


New author note: Hi everyone, my name is Karlo Bobiles and I am proud to be joining the Community Manager team on the Cisco Learning Network. A little background, I have more than a decade of experience in the Information Technology industry and a firm believer that learning is a lifelong journey.