There is a set of reserved .us domain names, for which any registration request will be rejected.

A list of such names is available on the website of the Authority, in the 'Reserved Names' section.

Besides the specific names included in the list, even the following name categories are reserved:

  A. All numbers with 5 digits or more

  B. All numbers with 5 digits - 4 digits (post codes e.g. 12345-1234)

  C. All phone numbers including toll-free numbers 

  D. All tag or label names with a hyphen in the third (e.g. "ab-cd2e4f4g") or fourth (e.g. "abc-d2e4f4g") position.