Thus, anyone can create a UUID and use it to identify something with near certainty that the identifier does not duplicate one that has already been, or will be, created to identify something else. While the probability that a UUID will be duplicated is not zero, it is so close to zero as to be negligible. When generated according to the standard methods, UUIDs are for practical purposes unique, without depending for their uniqueness on a central registration authority or coordination between the parties generating them, unlike most other numbering schemes. The term globally unique identifier (GUID) is also used. Other UUID Versions UUID version 1 UUID version 3 UUID version 5Ī universally unique identifier (UUID) is a 128-bit number used to identify information in computer systems.
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