US EIN Validator
Check whether an Employer Identification Number (EIN) is well formed and uses an IRS-assigned prefix.
How it works
An EIN is made up of 9 digits in the XX-XXXXXXX format. The tool validates the format and checks that the first two digits are not in the IRS list of unassigned prefixes. The hyphen is optional: 123456789 and 12-3456789 are treated the same way.
Facts about the EIN Validator
- An EIN has exactly 9 digits in the XX-XXXXXXX format.
- The first two digits indicate the IRS campus that assigned the number.
- Some prefixes (such as 07, 08 and 09) are not assigned by the IRS.
- Validation only checks format and prefix, without consulting any database.
Official references
See the official IRS pages to understand how EINs work:
- IRS β Employer ID Numbers: Explains what an EIN is, who needs it and how it is used.
- IRS β Valid EINs: Official prefix (first two digits) table by IRS campus.
- IRS β Apply for an EIN: Free official EIN application directly with the IRS.