Under .US nexus requirements .US domains may be registered only by the following qualified entities:
- Any United States citizen or resident,
- Any United States entity, such as organizations or corporations,
- Any foreign entity or organization with a bona fide presence in the United States
To ensure that these requirements are met, NeuStar frequently conducts "spot checks" on registrant information.
To prevent anonymous registrations that do not meet these requirements, the National Telecommunications and Information Administration has ruled that registrants of .us domains may not secure private domain name registration.
Registrants are required to provide complete contact information without omissions.
http://www.neustar.us/the-ustld-nexus-requirements/
"failure of a registration to satisfy the Nexus requirement will result in the name being placed upon a 30-day hold, during which time the Registrar will be notified and given the opportunity to correct the information with the Registrant. If no action is taken by the Registrar within the 30-day period, the registration will be cancelled and the name will be returned to โavailableโ status. The registration
fee will not be refunded."
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