“If you think about the history of the Internet and the history of domains, this is pretty massive,” said James Cole, a spokesman for the Internet Corporation for Assigned Names and Numbers, or ICANN, which reviews and approves applications for new extensions. “It could potentially affect every Internet user.”

People can purchase new Web addresses via registrars such as GoDaddy, Network Solutions and Name.com. Many already allow interested buyers to preregister for new addresses.

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