http://technology.canoe.ca/2010/07/26/14833401.html
340 days worth of IPv4 address space left – can IPv6 save the day?
Gone will be the familiar 4 octet (32-bit) addresses like 123.123.123.123, replaced instead with something like 2001:db8:85a3::8a2e:370:7334 – hexadecimal 128-bit. Will certainly take some getting use to.
IPv4 address space exhaustion can be blamed on many factors, the exploding accessibility of the Internet, the increasing use of small mobile devices (iPhone anyone?), and poor scavenging of huge pools of address space, sometimes snatched up by crooks for nefarious reasons.