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Updated: by Computer HopeSometimes abbreviated as Serial No., SN or S/N, a serial number is a unique number used for identification and inventory purposes. A serial number allows a company to identify a product and get additional information about it, for replacement, or as a means of finding compatible parts. Pictured is an example of what a serial number may look like on the back or side of a computer. 4CE0460D0GModel No. P6774y Locating serial numbersHardware - A serial number for a device can often be found on the bottom or back of the device.Software - serial numbers, also known as product identification numbers and CD keys. They may be accessible by logging into the software website with a verified user account, or may be listed on the software's physical package, or CD/DVD.
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Further information:Serial numbers identify otherwise identical individual units with many, obvious uses. Serial numbers are a deterrent against theft and counterfeit products, as they can be recorded, and stolen or otherwise irregular goods can be identified. Some items with serial numbers are, electronics, and appliances. And other transferable documents of value bear serial numbers to assist in preventing and tracing stolen ones.They are valuable in, as once a defect is found in the production of a particular batch of product, the serial number will identify which units are affected.Serial numbers for intangible goods Serial numbers may be used to identify individual physical or intangible objects (for example or the right to play an online multiplayer game). The purpose and application is different.
A software serial number, otherwise called, is usually not embedded in the software, but is assigned to a specific user with a right to use the software. The software will function only if a potential user enters a valid product code. The vast majority of possible codes are rejected by the software. If an unauthorised user is found to be using the software, the legitimate user can be identified from the code. It is usually not impossible, however, for an unauthorised user to create a valid but unallocated code either by trying many possible codes, or the software; use of unallocated codes can be monitored if the software makes an connection.Other uses of the term The term serial number is sometimes used for codes which do not identify a single instance of something. For example, the or ISSN used on magazines, journals and other, an equivalent to the (ISBN) applied to books, is assigned to each periodical.
It takes its name from the use of the word serial to mean a periodical.Certificates and (CA) are necessary for widespread use of. These depend on applying mathematically rigorous serial numbers and serial number arithmetic, again not identifying a single instance of the content being protected. Main article:In the UK (RAF) the individual serial takes the form of two letters followed by three digits, e.g., BT308—the prototype, or XS903—an at one time based at RAF. During the RAF aircraft that were or carrying secret equipment had '/G' (for 'Guard') appended to the serial, denoting that the aircraft was to have an armed guard at all times while on the ground, e.g., LZ548/G—the prototype, or ML926/G—a experimentally fitted with.
Prior to this scheme the RAF, and predecessor (RFC), utilised a serial consisting of a letter followed by four figures, e.g., D8096—a currently owned by the, or K5054—the prototype. The serial number follows the aircraft throughout its period of service.In 2009, the U.S. Published draft guidance for the to use serial numbers on prescription drug packages. This measure is intended to enhance the of drugs and to help prevent.Serial number arithmetic Serial numbers are often used in.
However, most sequence numbers in computer protocols are limited to a fixed number of bits, and will after a sufficiently many numbers have been allocated. Thus, recently allocated serial numbers may duplicate very old serial numbers, but not other recently allocated serial numbers. To avoid ambiguity with these non-unique numbers, 'Serial Number Arithmetic', defines special rules for calculations involving these kinds of serial numbers.are a more recent and sophisticated scheme for dealing with finite-sized sequence numbers in protocols.See also.