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Technology

Electronic serial numbers (ESNs) were created by the U.S. Federal Communications Commission (FCC) to uniquely identify mobile devices, from the days of AMPS in the United States starting in the early 1980s. The administrative role was taken over by the Telecommunications Industry Association in 1997 and is still maintained by them. ESNs are currently mainly used with CDMA phones (and were previously used by AMPS and TDMA phones), compared to International Mobile Equipment Identity (IMEI) numbers used by all GSM phones.[1]

The first 8 bits of the ESN was originally the manufacturer code, leaving 24 bits for the manufacturer to assign up to 16,777,215 codes to mobiles. To allow more than 256 manufacturers to be identified the manufacturer code was extended to 14 bits, leaving 18 bits for the manufacturer to assign up to 262,144 codes. Manufacturer code 0x80 is reserved from assignment and is used instead as an 8-bit prefix for pseudo-ESNs (pESN). The remaining 24 bits are the least significant bits of the SHA-1 hash of a mobile equipment identifier (MEID). Pseudo-ESNs are not guaranteed to be unique (the MEID is the unique identifier if the phone has a pseudo-ESN).

ESNs are often represented as either 11-digit decimal numbers or 8 digit hexadecimal numbers. For the decimal format the first three digits are the decimal representation of the first 8 bits (between 000 and 255 inclusive) and the next 8 digits are derived from the remaining 24 bits and will be between 00000000 and 16777215 inclusive. The decimal format of pseudo ESNs will therefore begin with 128. The decimal format separately displays 8 bit manufacturer codes in the first 3 digits, but 14 bit codes are not displayed as separate digits. The hexadecimal format displays an ESN as 8 digits and also does not separately display 14 bit manufacturer codes which occupy 3.5 hexadecimal digits.

As ESNs have essentially run out, a new serial number format, MEID, was created by 3GPP2 and was first implemented by Verizon in 2006. MEIDs are 56 bits long, the same length as the IMEI and, in fact, MEID was created to be a superset of IMEI. The main difference between MEID and IMEI is that the MEID allows hexadecimal digits while IMEI allows only decimal digits – "IMEI shall consist of decimal digits (0 through 9) only".[2]

The last of the previously unused ESN codes were allocated in November 2008.[3] Applications for assignments were accepted until June 30, 2010 using reclaimed ESN codes, those previously assigned to AMPS or TDMA phones and therefore not present on CDMA2000 systems. Reclaimed codes have also been used for UIMID assignments. Codes are assigned according to industry guidelines.[4]

Although ESN assignments may still occur in the future based on applications received before June 30, 2010, there have not been any assignments made since December 31, 2010.

References[edit]

External links[edit]


Original courtesy of Wikipedia: http://en.wikipedia.org/wiki/Electronic_serial_number — Please support Wikipedia.
This page uses Creative Commons Licensed content from Wikipedia. A portion of the proceeds from advertising on Digplanet goes to supporting Wikipedia.

171 news items

9 to 5 Mac (blog)

9 to 5 Mac (blog)
Tue, 25 Aug 2015 11:12:19 -0700

The status of an iPhone can be checked using a device-specific serial number that's called an IMEI (International Mobile Equipment Identity) number, ESN (Electronic Serial Number), or MEID (Mobile Equipment Identifier). IMEIs have traditionally been ...

Yahoo Tech

Yahoo Tech
Thu, 06 Aug 2015 04:31:00 -0700

But there's another way to tell that's more certain: When you look on the back of an iPhone 6, you'll see the phone's electronic serial number — known as the IMEI (international mobile equipment station identity) — engraved in tiny print just under ...
 
CNNMoney
Wed, 05 Aug 2015 05:33:45 -0700

... FDA cleared Q Inside Safety Technology acts as an electronic serial number in breast implants and other implantable and reusable medical devices to provide physicians and patients with access to secure online databases to retrieve device-specific ...
 
CNNMoney
Mon, 03 Aug 2015 05:33:45 -0700

VeriTeQ's FDA cleared Q Inside Safety Technology™ acts as an electronic serial number in breast implants and other implantable and reusable medical devices to provide physicians and patients with access to secure online databases to retrieve ...

RFID World Canada

RFID World Canada
Sun, 16 Aug 2015 15:06:25 -0700

... Safety Technology acts as an electronic serial number in breast implants and other implantable and reusable medical devices to provide physicians and patients with access to secure online databases to retrieve device-specific data, such as serial ...

BBC News

BBC News
Wed, 10 Jun 2015 05:56:15 -0700

By mimicking a legitimate mobile tower and tricking every phone in range into connecting to them, the boxes "catch" the international mobile subscriber number (IMSI) and electronic serial number (ESN) of each and reveal the exact location of its user ...
 
CNNMoney
Wed, 29 Jul 2015 05:22:30 -0700

... Safety Technology acts as an electronic serial number in breast implants and other implantable and reusable medical devices to provide physicians and patients with access to secure online databases to retrieve device-specific data, such as serial ...

Bankrate.com

Bankrate.com
Thu, 02 Apr 2015 03:30:00 -0700

Once you receive your phone, check its electronic serial number (ESN), mobile equipment identifier (MEID) or international mobile equipment identity (IMEI) number to make sure the phone isn't locked. Find your phone's number in the settings menu or ...
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