A worldwide test was under way on Wednesday of the next generation of internet addresses designed to replace the dwindling pool of 4.3 billion unique identifiers in the original system.
Hundreds of companies, organisations and institutions around the world are taking part in "World IPv6 Day," including internet giants such as Facebook, Google, Microsoft and Yahoo!
Internet Protocol version 6 is the new system of unique identifying numbers for websites, computers and other internet-connected gadgets and is replacing 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.
The number of available IPv4 addresses will run out later this year and the transition to IPv6 is needed to keep pace with the explosive growth in internet use.
US networking company Cisco forecast in a report released this month that the number of devices connected to the internet will top more than 15 billion by the year 2015, more than double the world's population.
Web users, for the most part, will be oblivious to the switch to IPv6 since an IP address such as 74.125.71.103, for example, will still appear in the address bar as google.com.
Google, which is enabling IPv6 on Google Search, Gmail, YouTube and other services, said "the vast majority (99.95 percent) of people will be able to access services without interruption" during the IPv6 test, which began at 0000 GMT Wednesday and is to last for 24 hours.
"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."
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.
Hundreds of companies, organisations and institutions around the world are taking part in "World IPv6 Day," including internet giants such as Facebook, Google, Microsoft and Yahoo!
Internet Protocol version 6 is the new system of unique identifying numbers for websites, computers and other internet-connected gadgets and is replacing 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.
The number of available IPv4 addresses will run out later this year and the transition to IPv6 is needed to keep pace with the explosive growth in internet use.
US networking company Cisco forecast in a report released this month that the number of devices connected to the internet will top more than 15 billion by the year 2015, more than double the world's population.
Web users, for the most part, will be oblivious to the switch to IPv6 since an IP address such as 74.125.71.103, for example, will still appear in the address bar as google.com.
Google, which is enabling IPv6 on Google Search, Gmail, YouTube and other services, said "the vast majority (99.95 percent) of people will be able to access services without interruption" during the IPv6 test, which began at 0000 GMT Wednesday and is to last for 24 hours.
"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."
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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