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IMEI Number Validator

Validate any mobile device IMEI number using the Luhn checksum algorithm. Supports 15-digit IMEI and 16-digit IMEISV.

Dial *#06# on your phone to instantly display the IMEI number.
IMEI Check
Only digits (0–9). IMEI = 15 digits; IMEISV = 16 digits.
IMEI Number Structure
PositionLengthMeaning
1–88 digitsTAC - Type Allocation Code (manufacturer & model)
9–146 digitsSerial Number (unique per device)
151 digitLuhn check digit
How the Luhn Algorithm Works
  1. Starting from the rightmost digit (check digit) and moving left, double every second digit.
  2. If doubling a digit gives a value > 9, subtract 9 from the result.
  3. Sum all digits (including the check digit).
  4. If the total is divisible by 10 (mod 10 = 0), the IMEI is valid.

IMEI Validator - Check Mobile Phone IMEI Numbers

An IMEI (International Mobile Equipment Identity) number is a unique 15-digit identifier assigned to every mobile phone globally. Standardized by the GSMA, IMEI numbers allow telecom networks to track, block, and verify handsets. In India, the Department of Telecommunications (DoT) maintains a Central Equipment Identity Register (CEIR) - launched nationally in 2023 - through which users can block stolen phones using their IMEI. India's telecom regulator TRAI has made IMEI validation a mandatory step in mobile device registration.

The Luhn Algorithm Explained

IMEI numbers are validated using the Luhn algorithm, a simple checksum formula developed by Hans Peter Luhn at IBM in 1954. The algorithm doubles every second digit from right to left, sums all digits, and checks if the total is divisible by 10. If it is, the IMEI is structurally valid. This same algorithm is used to validate credit card numbers, making it one of the most widely deployed error-detection formulas in the world.

Why Check Your IMEI

Before buying a second-hand mobile phone in India - a market worth over Rs. 20,000 crore annually - verifying the IMEI ensures the device is not blacklisted, stolen, or cloned. Cloned IMEI devices (identical IMEI shared by multiple phones) are a known fraud vector flagged by DoT. This tool validates the IMEI checksum instantly. For blacklist status checks, use the official CEIR portal after validating the format here.

IMEI Questions

IMEI (International Mobile Equipment Identity) is a unique 15-digit number identifying every mobile device globally. Find it by dialling *#06# on your phone, checking Settings → About Phone, or looking on the original box or SIM tray.

IMEI numbers use the Luhn algorithm for validation. Starting from the rightmost digit, every second digit is doubled. If doubling gives a value greater than 9, subtract 9. The sum of all digits must be divisible by 10 for the IMEI to be valid.

IMEI is 15 digits and uniquely identifies the physical device. IMEISV is 16 digits - it adds a 2-digit Software Version Number (SVN). The Luhn check applies only to the first 15 digits in both cases. IMEISV is used by telecom networks to track firmware versions.

Yes - dual-SIM phones have two IMEI numbers, one per SIM slot. When you dial *#06#, both IMEIs are displayed. Each must independently pass the Luhn checksum. Devices with eSIM may also have a separate EID number.

A blacklisted IMEI has been reported as stolen or lost. Network operators use IMEI blacklists to prevent such devices from connecting to their networks. Our tool validates the mathematical format (Luhn check) but does not check against stolen device databases. For blacklist checks, use India's CEIR portal (ceir.gov.in) or your carrier's service.
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