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Electronic Serial Number (ESN)

From the 1980s until 2005 (where it was superseded by the MEID format), mobile electronic devices were assigned a 32-bit number known as an Electronic Serial Number. This number was initially used with early cell phones and, later, predominantly with CDMA phones (such as those deployed by Sprint and Verizon). The ESN is usually represented by either an 11 digit decimal number or an 8 digit hexadecimal string.

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