UUID v5 Generator Online

Generate RFC 4122-Compatible UUID v5 Instantly and Securely

UUID version 5 produces deterministic unique identifiers by merging a namespace UUID and a user-specified name using the secure SHA-1 hashing algorithm. This ensures the same input always results in the same UUID, ideal for stable, permanent identifiers across users, URLs, assets, and distributed systems. Compared to version 3, UUID v5 is preferred due to enhanced security provided by SHA-1.

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About UUID v5

UUID version 5 (UUID v5) is a 128-bit, deterministic identifier generated from a namespace UUID and a name string using the SHA-1 hash function. This approach guarantees consistent UUIDs for identical inputs and offers better security compared to UUID v3.

UUID v5 Structure and Format

  • Length: 128 bits (16 bytes)
  • Pattern: 8-4-4-4-12 hexadecimal characters
  • Sample: 21f7f8de-8051-5b89-8680-0195ef798b6a
  • Character Count: 36 (including hyphens)
  • Version Indicator: '5' at the start of the third segment shows UUID v5
  • Variant Section: Fourth field contains reserved bits for compatibility

Example UUID v5 Explained

Here's how the UUID v5 sample 21f7f8de-8051-5b89-8680-0195ef798b6a breaks down:

  • 21f7f8de – First segment of SHA-1 hash output
  • 8051 – Second segment from SHA-1 hash
  • 5b89 – Specifies version 5 within hashed output
  • 8680 – Contains the variant and reserved info
  • 0195ef798b6a – Final segment of the SHA-1 output

Benefits of Using UUID v5

  • Creates consistent UUIDs from the same name and namespace
  • Stronger security than UUID v3 through SHA-1 hashing
  • Same inputs always yield the same UUID for reliability
  • Ideal for stable IDs in integrated distributed systems

Top Uses for UUID v5

  • Assigning UUIDs to canonical URLs or file paths
  • Creating persistent resource identifiers
  • Facilitating consistent IDs across distributed networks
  • Ensuring cross-platform UUID consistency
  • Syncing matching identifiers for identical entries in different systems

Security and Privacy Considerations

UUID v5 employs the SHA-1 hashing algorithm, which is safer than MD5 (used in v3). While SHA-1 isn't recommended for high-security cryptography, it's appropriate for generating deterministic identifiers.

Additional Resources