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The UUIDs generated by this site are provided AS IS without warranty of any kind, not even the warranty that the generated UUIDs are actually unique or error-free. You are responsible for using the UUIDs and assume any risk inherent to using them. You are not permitted to use the UUIDs generated by this site if you do not agree to these terms. Do not use any UUIDs found on cached versions of this page.
The Engineering of Version V3
A UUID Version V3 is a 128-bit identifier structured according to the latest RFC 9562 (which supersedes the legacy RFC 4122). While simple in representation, the bit-level arrangement is optimized for specific computational requirements—from random entropy to chronological sequence.
The Evolution: RFC 4122 to 9562
The shift to RFC 9562 formally recognized Version 7 (v7) as the new standard for time-series and database primary keys. Unlike the random v4, v7 provides "monotonicity"—the ability to sort UUIDs by their creation time without requiring external metadata, significantly reducing database B-Tree fragmentation.
Collision Math: The Birthday Paradox
For a Version 4 or 7 UUID, the probability of a collision is $1$ in $2^122$ (after accounting for version/variant bits). To have a 50% chance of a collision, you would need to generate **1 billion UUIDs per second for 85 years**. This makes them safe for use across disconnected, global distributed systems.
Database Locality & Performance
Modern database engines (PostgreSQL, MySQL, SQL Server) rely on indexed B-Trees. When you use a random UUID (v4), new records are inserted at non-sequential locations, causing constant index re-balancing. By using Version 7, the "Time-Ordered" prefix ensures that new records are appended to the *end* of the index, providing performance parity with traditional integers while keeping the benefits of a global, non-guessable ID.
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Go to Karuvigal.comSecurity Considerations: MAC vs. Random
Legacy **Version 1** UUIDs were often criticized because they leaked the machine's MAC address and time of generation—valuable metadata for attackers. Modern security practices dictate the use of Version 4 (Full Random) or Version 7 (Time-Ordered Random), which provide the necessary entropy while masking the underlying hardware details of the generating server.
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