What is UUID ?
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.
Based on the layout specification, UUID has five versions:
- Version 1 : MAC address & date-time
- Version 2 : DCE Security
- Version 3 : MD5 hash & Namespace
- Version 4 : Random Value
- Version 5 : SHA-1 hash & Namespace
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 this tool, 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.
universally unique identifier (UUID)
RFC 4122 - A Universally Unique IDentifier (UUID) URN Namespace
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