Professional EIN Validator & Generator
Verify US Employer Identification Numbers (EIN) for tax compliance or generate valid-format business tax IDs for development and testing.
EIN Validator
Format: 9 digits, typically displayed as 12-3456789
EIN Generator
What is an EIN?
An Employer Identification Number (EIN) is a unique nine-digit number assigned by the IRS to business entities operating in the United States for identification purposes.
EIN Format
The EIN is formatted as XX-XXXXXXX. The first two digits (the prefix) historically identified the IRS campus where the number was issued.
Usage & Security
EINs are used for tax filing, opening business bank accounts, and hiring employees. While not as sensitive as an SSN, they should be protected.
Understanding EIN Prefixes
Valid IRS Campus Prefixes
- Andover: 10, 12
- Atlanta: 60, 67
- Austin: 74, 75
- Brookhaven: 11, 13, 14, 16, 21, 22
- Cincinnati: 31, 32, 35, 36, 37, 38, 61
- Fresno: 95, 98
- Kansas City: 41, 42, 43, 48
- Memphis: 54, 62
- Ogden: 81, 82, 83, 84, 85, 86, 87, 88
- Philadelphia: 23, 24, 25, 33, 34, 40, 44, 45, 46, 47, 50, 51, 52, 53, 55, 56, 57, 58, 59, 65, 66, 68, 71, 72, 73, 77, 80, 90, 91, 92, 93, 98, 99
Quick Fact
Did you know? Certain prefixes are reserved or invalid. For example, prefixes 00, 07, 08, 09, 17, 18, 19, 28, 29, 49, 69, 70, 78, 79, 89, 96, and 97 are currently not used by the IRS.