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Asked: 2026-05-15T13:22:00+00:00

I am working on a project where I need to generate approximately 1 billion

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I am working on a project where I need to generate approximately 1 billion GUIDs.

I know GUIDs are not guaranteed to be unique but are unique almost all of the time.

If I generated a billion GUIDs, what is the probability that there will be a match?

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1 Answer

  1. Editorial Team

    Blogpost: GUIDs are globally unique, but substrings of GUIDs aren’t

    The .NET GUID consists of

    • 60 bits of timestamp,
    • 48 bits of computer identifier,
    • 14 bits of uniquifier, and
    • six bits are fixed

    So the UUID probability quoted by Oscar does not work here. But if you create all your 1 billion GUIDs from one computer, there is no chance to get a duplicate (except you are playing with the clock 😉

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