IP Addresses

The Digital Divide on IP Addresses We are running out of IPv4 Internet addresses, but who is using them all up? The IP address space usage per capita differs greatly between nations, which points to a digital divide.




If we would distribute IPv4 addresses uniformly over the world population, there would be less than 1 address per person. In fact, on the average, 0.54 addresses would be available per person (including all babies, etc). In 2006 this number was 0.57, population has increased in the meantime

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X-51 Waverider Makes Historic Ramjet-Powered Hypersonic Flight

ScienceDaily (May 27, 2010) — An X-51A Waverider flight-test vehicle successfully made the longest supersonic combustion ramjet-powered hypersonic flight May 26 off the southern California Pacific coast.The more than 200 second burn by the X-51's Pratt & Whitney Rocketdyne-built air breathing scramjet engine accelerated the vehicle to Mach 5. The previous longest scramjet burn in a flight test was 12 seconds in a NASA X-43.




Air Force officials called the test, the first of four planned, an unqualified success. The flight is considered the first use of a practical hydrocarbon fueled scramjet in flight.



"We are ecstatic to have accomplished most of our test points on the X-51A's very first hypersonic mission," said Charlie Brink, a X-51A program manager with the Air Force Research Laboratory at Wright-Patterson Air Force Base, Ohio. "We equate this leap in engine technology as equivalent to the post-World War II jump from propeller-driven aircraft to jet engines."

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