UUID Generator

Generate various types of UUIDs (Universally Unique Identifiers) for your applications. Choose from different versions based on your specific needs.

v1MAC + Timestampv4Randomv6Timestamp Reorderedv7DB OptimizedNILEmptyGUIDMicrosoft

UUID v1 (MAC Address-based)

Generate time-based UUIDs that include MAC address and timestamp information. These UUIDs are sortable by creation time but may reveal information about the generating machine.

Bulk Generation

Generate multiple UUIDs at once for batch operations

Or

Only 1 to 10,000 allowed

API Information

Use these endpoints to integrate UUID generation into your applications

GEThttps://fastweb.tools/api/uuid/v1

Generate a single v1 UUID

GEThttps://fastweb.tools/api/uuid/v1?count=100

Generate multiple v1 UUIDs (max: 10,000)

What is UUID v1?RFC 4122

UUID v1 is a time-based UUID format that combines the current timestamp with the MAC address of the generating machine. This creates a globally unique identifier that can be sorted by creation time.

Structure Components:

  • • Timestamp: 60-bit value representing 100-nanosecond intervals since October 15, 1582
  • • Clock Sequence: 14-bit random or sequential value
  • • Node ID: 48-bit MAC address or random value
  • • Version: 4-bit version number (0001)

When to Use UUID v1

✓ Good for:

  • • Database records requiring time-based sorting
  • • Systems where creation time is important
  • • Legacy systems expecting time-based UUIDs
  • • Applications requiring guaranteed uniqueness across nodes

✗ Avoid when:

  • • Privacy is a concern (MAC address exposure)
  • • High-frequency generation on same machine
  • • Security through obscurity is needed
  • • Modern alternatives (v7) are available

Technical Deep Dive

Performance Characteristics:

  • • Generation Speed: Very fast (timestamp + MAC lookup)
  • • Collision Probability: Extremely low with proper implementation
  • • Storage Efficiency: 128 bits (16 bytes)
  • • Index Performance: Good for time-based queries

Security Considerations:

  • • MAC address may reveal hardware information
  • • Timestamp reveals approximate creation time
  • • Not suitable for security tokens
  • • Consider UUID v4 for privacy-sensitive applications

Use Cases & Examples

Enterprise Applications:

  • • Database primary keys with time ordering
  • • Audit trails and logging systems
  • • Document management systems
  • • Transaction processing systems

Development Scenarios:

  • • Migration from sequential IDs to UUIDs
  • • Multi-node systems requiring coordination
  • • Systems with strict ordering requirements
  • • Legacy compatibility requirements