UUID Generator

Generate UUID for Version 1 and Version 4 Online For Free

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Version 4 uuid :


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What is UUID - universally unique identifiers ?

UUID stands for universally unique identifiers as described in RFC-4122. An UUID is 128 bits value and "practically unique" (not guaranteed unique) across space and time. They are useful for identifiers for documents, hosts, application clients and other situation where a unique value is necessary. UUIDs are standardized by the Open Software Foundation (OSF) as part of the Distributed Computing Environment (DCE).

UUID : probability of duplicates

The chance of two randomly generated UUID to be duplicate is very low. only after generating 1 billion UUIDs every second for the next 100 years, the probability of creating just one duplicate would be about 50%. Which in the practical sense makes two UUIDs very unique but not theoretically.

The UUID versions

Based on the layout specification, UUID has five versions:

UUID1 : MAC address & Date-time

UUID version 1 values are generated using the MAC address of the host ( the computer on which it was generated) and time-stamp.

UUID4 : Random Value

UUID version 4 generates a "random" UUID from truly-random or pseudo random numbers. If you just need to generate a UUID then this is probably you want.

About UUID Generator

uuidgenerator.org is a free online UUID generator for version1 and 4. The bulk UUID generator, outputs UUID1 and UUID4 codes in bulk set. Just select the version in "Bulk UUID Generator", enter the number of value you want and hit on "Generate" button. That's it.

UUID References :

universally unique identifier (UUID)

RFC 4122 - A Universally Unique IDentifier (UUID) URN Namespace


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