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You’ve no doubt heard the news stating that we will run out of IP addresses in the next half hour or so. Forgive my glibness, but I’ve been hearing this for 10 years or more.
Note:
As I was editing this edition for publication, the Number Resource Organization (NRO) reported that as of February 3, 2011, the free pool of IPv4 address space has been depleted. You can read all about it here: http://www.nro.net/news/ipv4-free-pool-depleted.