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FAQ
The UUID is generated by concatenating the 48 bit MAC address and the 60 bit timestamp, which sums up to 108 bits. The remaining 20 bits consist of 5 to 7 bits which are the variant (uses 4 bits) and the version (uses 1 to 3 bits) of the UUID and the remaining 13 to 14 bits are the clock sequence.
A time-based UUID, also known as the version 1 UUID, is generated using the current time and a unique identifier specific to the computer or network that produces the UUID. The timestamp ensures the UUID is unique, even if multiple UUIDs are generated simultaneously.
The structure of a UUID Version 4 consists of 128 bits, represented by 32 hexadecimal digits. Unlike other versions that include specific components derived from certain inputs, UUID Version 4 relies solely on random numbers to create unique identifiers. The primary advantage of UUID Version 4 lies in its randomness.
To generate a single UUID, run the uuidgen command without any arguments. Out of the box, uuidgen will generate a random UUID each time it runs. Execute the following command in your terminal: uuidgen.
Their uniqueness does not depend on a central registration authority or coordination between the parties generating them, unlike most other numbering schemes. While the probability that a UUID will be duplicated is not zero, it is generally considered close enough to zero to be negligible.