.US Domain Name Rules/Requirements

The following regulations must be followed while registering a .US domain name:

The Name Server restrictions are as follows:
- It is mandatory to mention at least 2 Name Servers during Registration.
- These Name Servers' IP Address should be registered in the United States of America (USA).
While providing Contact details for .US domain names, you would be asked to specify the Nexus Information, which pertains to:
- Application Purpose: Whether the domain name being registered is for Business use (Profit/Non-profit), Personal use, etc.
- Nexus Category: Whether the person registering the domain name is a resident/citizen of the United States of America, or the domain name is registered for an organization based in the United States of America, or having an office or facility therein.
The following words/phrases, or combination of any of these seven words/phrases are not allowed in any .US domain name:
- shit
- piss
- fuck
- cunt
- cocksucker
- motherfucker
- tits
Domain names satisfying the following categories are reserved:
- All domains of any length beginning with 18XX or 1-8XX or 8XX, where X is any number from 0 to 9 (both 0 and 9 being inclusive).
  
  Example:
  - 1800abc.us
  - 812abc-def.us
  - 1-805-999-9999.us
- All domains beginning with NXX or 1NXX or 1-NXX followed by exactly seven numbers not including hyphens, where N is any number from 2 to 9 (both 2 and 9 being inclusive) and X is any number from 0 to 9 (both 0 and 9 being inclusive).
  
  Example:
  - 12-999-9999.us
  - 19009998888.us
  - 1-212---1-2-3-4-5-6-7--.us
- All domains beginning with XXXXX, where X is any number from 0 to 9 (both 0 and 9 being inclusive).
  
  Example:
  - 20176.us
  - 90210-Melrose.us
Note

Furthermore, some other .US domain names have been reserved by the .US Registry.

Additional Information
Reserved Names List (available under Registrar Resources on the far right)