On Monday, ICANN, which maintains the Internet's addressing systems, said it had for the first time added IPv6 addresses to the appropriate files and databases on six of the world's 13 root server networks--the systems containing the authoritative databases that form a master list of all. Before ICANN did this, those who were using IPv6 had no choice but to run it alongside IPv4, because the root server networks accommodated only IPv4.
"IPv6 will be an essential part (of) our future, and support in the root servers is essential to the growth, stability, and reliability of the public Internet," said the chairman of ICANN's Internet service and connectivity provider constituency, Tony Holmes. "The ISP community welcomes this development as part of the continuing evolution of the public Internet."
Almost all IP addresses currently use the fourth version of the protocol, IPv4, but the length of those addresses limits their number of permutations to around four billion. As more people become connected to the Internet and as more devices are manufactured that can themselves intelligently connect to the Internet, that number is rapidly becoming insufficient.
Businesses are now being urged to start migrating to the sixth version of the Internet protocol--IPv6. Because it uses a longer string of characters, this version makes it possible to have more than 340 trillion trillion trillion possible unique addresses. IPv6 has already been, where many employees need to be hooked up to a semiprivate network, but ICANN's latest move marks .
David Conrad, ICANN's vice president of research, said the addition of IPv6 addresses for the root servers "enhances the end-to-end connectivity for IPv6 networks, and furthers the growth of the global interoperable Internet."
Plan now for shift to IPv6 access
Jay Daley, director of IT for Nominet, the not-for-profit company that runs the .uk registry, said the onus was now on those companies running large Web sites to make the transition to IPv6.
"IPv6 and IPv4 don't interact. If you have an IPv6 client, it can't reach an IPv4 server anywhere," said Daley. "If you really want to see take-up of IPv6, we need the people who run high-volume Web sites to switch over to providing both IPv6 and IPv4 access to them. There are very few sites out there that do that."
Daley explained that all operating systems and most enterprise equipment now supports IPv6 "quite happily," but some low-cost consumer-grade equipment and some applications do not yet support it.
IT managers, said Daley, need to "start planning for how the Web services that they provide will be accessible over IPv6."
"They need to consider using IPv6 when they need any new addresses internally," said Daley. "They must also make sure that they do a repetitive audit over the next few years to make sure their equipment and software supports IPv6. People might be sitting there thinking 'Why do I need to do this?' But it may soon be extremely difficult to get hold of any more IPv4 addresses. It is imperative to ensure you don't suddenly find yourself in a crunch and all of a sudden have to make shift to IPv6 without planning."
Daley also warned that, because IPv4 addresses are now "close to running out," such addresses are likely to become significantly more expensive in the near future.
David Meyer of ZDNet UK reported from London.