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:
- Select a Namespace: Use a predefined namespace (DNS, URL, OID, X.500) or provide a custom UUID as a namespace.
- Enter a Name: Provide a string (e.g., domain name, object identifier, or user ID).
- Generate UUID v5: The tool hashes the namespace and name using SHA-1 and formats the result as a UUID v5.
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
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.