In general, the IRS has two forms to identify foreign status:
W-8BEN is used by individuals to claim foreign status and/or treaty benefits. A U.S. tax identification number is required if requesting a treaty benefit exemption from tax withholding. Form W-8BEN Individual Certificate of Foreign Status
W-8BEN-E is used by foreign entities to claim foreign status and/or treaty benefits. A U.S. tax identification number, an individual tax identification number (ITIN), or Foreign Tax ID number is required if requesting a treaty benefit exemption from tax withholding. Form W-8BEN-E Entity Certificate of Foreign Status (Non-FATCA)
Chart of W-8 Form Requirements