Luhn Algorithm Validation · Instant · Free
IMEI Validator
Enter any 15-digit IMEI number to instantly validate it using the Luhn algorithm. Confirm whether an IMEI is correctly formatted and genuine before running a full check.
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How IMEI Validation Works
Every genuine IMEI number must pass the Luhn algorithm — a checksum formula used to validate identification numbers. The 15th digit of an IMEI is a calculated check digit that must satisfy this formula.
If the check digit doesn't match, the IMEI is either incorrectly typed or fabricated. Our validator runs this check instantly and also cross-references the first 8 digits (the TAC code) against our device database.
A valid IMEI must be exactly 15 digits, pass the Luhn checksum, and have a TAC prefix that exists in the GSMA registry.
Anatomy of an IMEI Number
353847101234567
Digits 1–8
TAC Code
Model & manufacturer
Digits 9–14
Serial Number
Unique device ID
Digit 15
Check Digit
Luhn validation