IPv4 Address Depletion

I wanted to pass this along from a friend of mine at Juniper Networks - Bill Kine.  As you probably know, the Internet registry is completely out of IPv4 addresses. The regional registries are also running out of their meager supplies of addresses. So, why hasn’t the Internet World ended? 
The main reason that IPv4 is still viable for new web sites is the implementation of Carrier Grade NAT. That’s NAT on steroids! It facilitates an extremely scalable address translation mechanism for service providers. However, even CG-NAT will have a limit. The fact still remains that IPv6 will need to happen eventually. So this paper also discusses some transitional and coexistence strategies for migrating to IPv6.
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