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Android & Firmware • Luhn Check Digit Calculator

IMEI Validator & Luhn Algorithm Check Digit Calculator

Validates 15-digit International Mobile Equipment Identity numbers, calculates Luhn check digits, and identifies the issuing telecom body.

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IMEI Validator & Luhn Check Digit Checker

Android & Firmware

Validates 15-digit International Mobile Equipment Identity numbers, calculates Luhn check digits, and identifies the issuing telecom body.

Status:Enter IMEI
TAC (Type Allocation):—
Reporting Body:—
Luhn Check Digit:—
Barcode for IMEI →
Quick Actions Ready
Flash Repair Context: When rewriting NVRAM / NVDATA after baseband null repair in tools like SN Write Tool, WriteIMEI, or MauiMETA, the 15th digit MUST match the mathematical Luhn checksum or the radio baseband will reject the modem config.

Frequently Asked Questions

What is the Luhn algorithm used for in IMEI validation?

The Luhn algorithm (modulus 10 check) calculates the 15th check digit of an IMEI by alternating doubled digits and summing individual digits. If the total modulo 10 is 0, the IMEI sequence is mathematically authentic.

What do the first 8 digits of an IMEI represent?

The first 8 digits comprise the Type Allocation Code (TAC), which identifies the specific device manufacturer, brand, and hardware model registered with the GSMA.

Is it legal to repair or restore an IMEI on a mobile phone?

Restoring an original factory IMEI lost during corrupted NVRAM/EFS flashing is standard repair practice. However, altering or masking an IMEI to circumvent carrier blacklists or legal restrictions is prohibited by law in many jurisdictions.

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