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4.2.11

run out of internet addresses, IPv4 - IPv6

The current Internet Protocol IPv4 has run out of internet addresses. The IPv4 uses 32 bits addresses which has 232 possible addresses and all 4,294,967,296 addresses have now been assigned.

More from www.mashable.com, http://mashable.com/2011/02/03/ipv4-ipv6-guide/