Test of new generation of Internet addresses underway

A worldwide test of the next generation of Internet addresses was underway on Wednesday to replace the dwindling reservoir of numbers in the original system.

Hundreds of companies, organizations and institutions around the world are taking part in "World IPv6 Day," including Internet giants such as Facebook, Google, Microsoft and Yahoo!

IPv6 is the next-generation of unique identifying numbers for computers and other gadgets connecting to the Internet and is designed to replace the original addressing system, IPv4, which is nearing exhaustion.

IPv6 provides more than four billion times more addresses than IPv4 - more addresses, for example, than there are grains of sand on Earth.

Web users, for the most part, will be oblivious to the switch, which began at 0000 GMT Wednesday and is to last for 24 hours, since complex IP numbers will still appear as words and domains, such as google.com.

Google, which is enabling IPv6 on Google Search, Gmail, YouTube and other services for 24 hours, said "the vast majority (99.95 percent) of people will be able to access services without interruption."

"Either they'll connect over IPv6, or their systems will successfully fall back to IPv4," Google network engineer Lorenzo Colitti said in a blog post.

Colitti estimated that 0.05 percent of systems may fail to fall back to IPv4, making Google, Facebook, Yahoo!, Bing and other participating websites "slow or unresponsive."

Facebook network engineer Donn Lee said World IPv6 Day "will enable the industry to gain insights about potential IPv6 issues, find solutions, and accelerate global adoption of IPv6."

Lee estimated that 99.97 percent of Facebook users would not be affected by the test.

The non-profit Internet Corporation for Assigned Names and Numbers (ICANN), which regulates the architecture of the Web, doled out the last batches of IPv4 numbers in February.

The change to IPv6 mainly impacts Internet service providers, websites and network operators who have to make sure their systems can handle the new online addresses and properly route traffic.

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