Canadian · Validation
US EIN validator.
Check a US Employer Identification Number's format and its two-digit prefix against the IRS's published list — and see which IRS campus that prefix belongs to.
What a pass means: an EIN is 9 digits written NN-NNNNNNN. The IRS publishes which two-digit prefixes are valid. A pass means the format and prefix are plausible — it does not prove the EIN exists or belongs to anyone. There is no public check digit for EINs.
Inputs
Result
Enter an EIN and press Check.
How EIN prefixes work
A US Employer Identification Number (EIN) is a 9-digit number the IRS assigns to identify a business entity, written NN-NNNNNNN. Per the IRS, the first two digits show the IRS campus that assigned it, or that the applicant applied online.
This tool does two things: it confirms the input is exactly 9 digits, and it looks the first two digits up in the IRS's list of valid prefixes. Some prefixes (for example 33, 39, 41, 42, 46, 85–88, 92, 93 and 99) appear under both a campus and the Internet channel, so the result may list more than one.
Worked example: 12-3456789 has prefix 12, which the IRS lists under Andover, so it passes. 07-1234567 has prefix 07, which is not on the list, so it fails.
Unlike a SIN or NPI, the IRS does not publish any check-digit algorithm for EINs, so no arithmetic checksum can be run.
Format match — not proof the EIN exists
A pass only means the number is 9 digits with an IRS-listed prefix. It does not query any IRS database, and it cannot tell you whether the EIN was actually issued, is active, or belongs to a particular business. To confirm an EIN, ask the entity for its IRS confirmation letter (CP 575 or 147C) or use a Form W-9. Nothing you type is transmitted, stored, or logged.