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IMEI

IMEI (International Mobile Equipment Identity) check digit using Luhn algorithm. 15-digit unique identifier for mobile phones (14 digits + 1 check). Used by GSM, WCDMA, LTE networks for device identification, tracking, and blocking stolen phones.

Properties

Property	Value
Category	Checksums
Sub-category	Device Identifier
Security status	🎓 Educational Only
Complexity	Beginner
Inventor	GSMA (GSM Association)
Year	1992
Origin	Not specified
Source	`algorithms/checksum/imei-checksum.js`

Security

Status: 🎓 Educational Only

No vulnerabilities are recorded for this implementation.

Notes

Format: AA-BBBBBB-CCCCCC-D (TAC-FAC-SNR-CD)
TAC: Type Allocation Code (8 digits)
FAC: Final Assembly Code (2 digits) - deprecated
SNR: Serial Number (6 digits)
CD: Check Digit (1 digit) using Luhn algorithm
Dial *#06# on most phones to see IMEI
Used for: Device tracking, theft reporting, network blocking
Example: 490154203237518
Detects: All single-digit errors
Detects: Most adjacent transposition errors

Documentation

References

python-stdnum IMEI implementation

Test vectors

3 vectors ship with this algorithm and run in the test suite. Byte values are hexadecimal.

Vector 1 — Example IMEI

Field	Value
`input`	`3439303135343230333233373531`
`expected`	`08`

Vector 2 — Another IMEI

Source: IMEI validation

Field	Value
`input`	`3335323039393030313736313438`
`expected`	`01`

Vector 3 — IMEI test 864586030236528

Field	Value
`input`	`3836343538363033303233363532`
`expected`	`08`

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