UUID3 Generator
Generate name-based UUIDs using MD5 hashing
IDUUID1 Generator
Generate time-based UUIDs with MAC address
UUID1
Click 'Generate' to create your first UUID1
About UUID1 Generator
UUID1 (Universally Unique Identifier version 1) generates time-based identifiers that combine timestamp information with MAC address and clock sequence data. This version ensures uniqueness across distributed systems while providing natural chronological ordering capabilities.
Generate UUID1 identifiers with embedded timestamp information that allows for natural sorting by creation time. The tool includes MAC address-based node identifiers and clock sequence values for guaranteed uniqueness across distributed systems.
Ideal for distributed systems requiring time-ordered identifiers, event logging with timeline requirements, legacy system integration, and applications where chronological ordering of identifiers is important for business logic or data analysis.
UUID1 provides predictable ordering and guaranteed uniqueness across systems, making it excellent for database clustering and distributed applications. The embedded timestamp allows for efficient range queries and chronological data organization.
Key Features
- Time-based generation with embedded timestamps
- Natural chronological ordering
- MAC address-based uniqueness
- Suitable for distributed systems
- Efficient range queries support
- Legacy system compatibility
UUID1 Frequently Asked Questions
What information does UUID1 contain?
UUID1 contains a timestamp (when it was created), MAC address of the generating machine, and a clock sequence number. This makes it predictable but ensures uniqueness across distributed systems.
Are UUID1s secure for sensitive applications?
No, UUID1 can leak sensitive information including the MAC address and creation time. For security-sensitive applications, use UUID4 instead which provides complete randomness.
When should I use UUID1 over UUID4?
Use UUID1 when you need natural time-based ordering, working with legacy systems that expect time-based UUIDs, or in distributed systems where the embedded timestamp provides business value.
Can UUID1 cause collisions?
UUID1 has extremely low collision probability due to its combination of timestamp, MAC address, and clock sequence. However, poor clock synchronization in distributed systems could potentially cause issues.
Implementation Tips
- Consider privacy implications before using UUID1
- Ensure proper clock synchronization in distributed systems
- Use UUID1 when chronological ordering is important
- Consider UUID6 or UUID7 for better database performance
- Monitor clock sequence rollover in high-frequency generation
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