To Anthony J. Bufort, a Web site builder in Hackensack, N.J., the Internet address plasticash.com was a "rare find" that any credit card company would want.

Last June, when he discovered to his surprise that nobody owned it, he paid $70 to InterNIC, the government-chartered authority that supervises Web names. Once plasticash.com was his, he expected to sell it at a hefty profit.

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