A check-digit can be converted from the 18 digit result using the base 10 Luhn algorithm and appended to the end. Decimal Form – this standard is converted by changing the manufacturer 32-bits code to decimal and padding on the left with '0' digits to 10 digits and separately converting the serial number to decimal and afterwards padding on the left to 8 digits.
In the second case when at least one digit is A - F range the check-digit algorithm uses base 16 arithmetic. When the all elements are from '0'-'9' range than the check-digit is converted by using the normal base 10 Luhn algorithm. We can distinguish two standard formats for MEIDs identifier, and both may contain an optional check-digit: The MEID Number consists of the following parts: The MEID is a replacement for ESN (electronic serial number) since 2006. The MEID number is permanently stored in the device. The MEID Number (Mobile Equipment Identifier) is a unique 56-bit identification code for CDMA mobile devices. Generally speaking each device have assigned one IMEIs, ESN or MEID.
IMEIs, ESNs and MEIDs are numbers and codes used by the mobile producers in order to ensure the unique identificator for each devices.