Microsoft has just bought more than half a million IPv4 addresses from Nortel Networks for $7.5 million (or $11.25 per address), as part of Nortel’s bankruptcy proceedings. Internet IPv4 addresses are hard to come by these days, notes ZDNet’s Steven Vaughan, so it’s no surprise that Microsoft bought 666,624 of them as demand for Internet addresses increases.
http://blogs.forbes.com/parmyolson/2011/03/28/morning-tech-wrap-apple-google-firefox/