Online GUID Generator
Unlimited Free GUIDs for Developers and Testers
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What is a GUID?
GUID (or UUID) is an acronym for 'Globally Unique Identifier' (or 'Universally Unique
Identifier'). It is a 128-bit integer number used to identify resources. The term
GUID is generally used by developers working with Microsoft technologies, while
UUID is used everywhere else.
How unique is a GUID?
128-bits is big enough and the generation algorithm is unique enough that if 1,000,000,000
GUIDs per second were generated for 1 year the probability of a duplicate would
be only 50%. Or if every human on Earth generated 600,000,000 GUIDs there would
only be a 50% probability of a duplicate.
How are GUIDs used?
GUIDs are used in enterprise software development in C#, Java, and C++ as database keys, component identifiers,
or just about anywhere else a truly unique identifier is required. GUIDs are also
used to identify all interfaces and objects in COM programming.
More Information About GUIDs
Globally Unique Identifier
- Wikipedia, the free encyclopedia
GUID Structure - Microsoft.com
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