UUID v5 Generator

What is a UUID v5?

A UUID v5 (Universally Unique Identifier version 5) is a deterministic, namespace-based unique identifier that is generated using a cryptographic hash function (SHA-1). Unlike UUID v4, which is randomly generated, UUID v5 produces the same identifier for the same input (namespace + name), making it ideal for consistent, non-random identification across distributed systems.

Why Use our UUID v5 Generator?

Our UUID v5 Generator allows you to quickly create unique, namespace-based UUIDs that are compliant with RFC 4122 standards. Whether you need a reliable way to generate persistent identifiers for databases, distributed applications, or digital assets, our tool ensures accuracy and efficiency.
Key Features:

  • Instant UUID v5 Generation – Enter a namespace and name to generate a deterministic UUID.
  • RFC 4122 Compliant – Ensures compatibility with modern applications and databases.
  • Secure and Hash-Based – Uses SHA-1 hashing for consistent results.
  • Supports Predefined & Custom Namespaces – Use standard UUID namespaces or define your own.
  • Free & No Sign-Up Required – Generate UUID v5 hashes online instantly.

How UUID v5 Works

UUID v5 uses a namespace UUID and a name (string input) to generate a unique identifier. The process follows these steps:

  1. Select a Namespace: Use a predefined namespace (DNS, URL, OID, X.500) or provide a custom UUID as a namespace.
  2. Enter a Name: Provide a string (e.g., domain name, object identifier, or user ID).
  3. Generate UUID v5: The tool hashes the namespace and name using SHA-1 and formats the result as a UUID v5.
The final UUID v5 follows this format:
xxxxxxxx-xxxx-5xxx-yxxx-xxxxxxxxxxxx
  • The 5 in the third group identifies it as a UUID version 5.
  • The y in the fourth group determines the variant (e.g., RFC 4122 compliant UUIDs).
  • The remaining values are derived from the SHA-1 hash.

When to Use UUID v5 Instead of UUID v4

While UUID v4 is widely used for random identifiers, UUID v5 is preferred in cases where consistency and determinism are required:

  • Database Keys: Generate consistent UUIDs for specific objects.
  • Content Identifiers: Assign unique, repeatable IDs to digital assets.
  • User & Object References: Ensure stable identifiers for namespaced entities.
  • Security & Encryption: Reduce risk by using hashed identifiers instead of plaintext names.
  • Distributed Systems: Maintain consistency across microservices and networked environments.

Predefined Namespaces for UUID v5

UUID v5 supports several predefined namespaces:

  • OID: 6ba7b812-9dad-11d1-80b4-00c04fd430c8
  • DNS: 6ba7b810-9dad-11d1-80b4-00c04fd430c8
  • URL: 6ba7b811-9dad-11d1-80b4-00c04fd430c8
  • X.500: 6ba7b814-9dad-11d1-80b4-00c04fd430c8
Alternatively, users can provide a custom namespace UUID to generate unique identifiers tailored to their application.

Benefits of Using UUID v5

  • Consistency: The same input will always produce the same output.
  • Uniqueness: Ensures globally unique identifiers.
  • Better Organization: Useful for indexing and categorizing structured data.
  • Security: Hash-based, making it harder to reverse-engineer.
  • Scalability: Works seamlessly in distributed environments.