Network and Web site operators are coming under increasing pressure to support IPv6 -- the long-anticipated upgrade to the Internet's main communications protocol -- as more market indicators point to the rapid depletion of addresses for IPv4. The Number Resource Organization (NRO announced on Tuesday that only 8% of IPv4 addresses remain unallocated. The NRO consists of the five Regional Internet Registries, which dole out blocks of IPv4 and IPv6 address space to carriers. The NRO's latest figures are significant because the Internet infrastructure must be upgraded to support both IPv4 and IPv6. IPv4 uses 32-bit addresses and can support 4.3 billion devices connected directly to the Internet. IPv6, on the other hand, uses 128-bit addresses and supports a virtually unlimited number of devices. When IPv4 addresses run out -- which is projected to occur in 2011 or 2012 -- carriers including Verizon and Comcast plan to provide their customers with IPv6 addresses. Meanwhile, Web site operators such as Google and Netflix are adopting IPv6 so that users with IPv6 addresses can view their content. Despite the efforts of these IPv6 pioneers, the NRO says the Internet industry is not prepared for IPv4 address space to run out.
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