IPv6, the long-awaited upgrade to the Internet’s main communications protocol, may be showing signs of life with MCI’s announcement today of its first commercial customer for IPv6 services.

Cray Inc., the supercomputing giant in Seattle, is the first U.S. company to say it is using MCI’s IPv6 overlay service. MCI says it has a handful of other U.S. corporate and government clients for the service, which the Internet service provider quietly made available in January.

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