In Pictures: Why the Internet needs IPv6

Explosive growth of Internet users, devices, apps creates demand for more IP addresses

What about allocated-but-unused IPv4 addresses?

A statistic touted by IPv6 naysayers is the amount of IPv4 address space that is allocated but unused, which is estimated at 1.2 billion IPv4 addresses by Addrex. These unused IPv4 addresses belong to U.S. government agencies, universities and companies involved in the original network research that led to the Internet. Companies like Addrex facilitate the sale of unused IPv4 addresses to service providers to extend the life of IPv4. Here is a list of lucky U.S. organizations with /8 blocks of IPv4 addresses, which have 16.7 million IPv4 addresses each and are worth $500 million or more on the resale market, Addrex says:- General Electric, MIT, IBM, MERIT Network (Michigan universities), Xerox, Prudential Insurance Co., Eli Lilly & Co., Halliburton Co., Ford Motor Co., DuPont

3 of 12
VIEW ALL THUMBNAILS

Most Popular

What's the difference between an Intel Core i3, i5 and i7?
Samsung’s 2013 Smart TVs: everything you need to know
How do I connect my TV to the Internet?
Laser vs. inkjet printers: which is better?
Windows 7 Home Premium vs. Windows 7 Professional

Best Deals on PCWorld

Printers & ScannersView all »
NotebooksView all »
TabletsView all »
Mobile PhonesView all »
Networking, Wireless & VoIPView all »

Plan Comparison

Prev Next
Loading...
Deals powered by WhistleOut

rhs_login_lockSign up to PC World Today for the latest news, reviews and galleries from PC World Australia.

Resources

Broadband test
Is your internet really as fast as you think it is? Find out here.