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IPv6 Deployment Status
As of November 2007, IPv6 accounts for a tiny percentage of the live addresses in the publicly-accessible Internet, which is still dominated by IPv4.
With the notable exceptions of stateless auto-configuration, ~ many of the features of IPv6 have been ported to IPv4 in a more or less elegant manner. Thus IPv6 deployment is primarily driven by IPv4 address space exhaustion, which has been slowed by the introduction of classless inter-domain routing (CIDR) and the extensive use of network address translation (NAT).
Estimates as to when the pool of available IPv4 addresses will be exhausted vary widely, and should be taken with a lot of caution.