UUID v1 Online Generator
Quickly create standards-compliant, timestamp-based UUIDs (Version 1) online.
UUID version 1 creates universally unique identifiers by combining a high-resolution timestamp with the device's MAC address, resulting in unique and time-sequential UUIDs. This makes UUID v1 perfect for systems that require chronological ordering, such as legacy applications, distributed databases, audit trails, and event logging. Please note: Because UUID v1 includes both timestamp and device-specific information, exercise caution and avoid using in privacy-critical applications.
Bulk UUID v1 Generator
UUID Validation Tool
About UUID v1
A UUID version 1 (UUID v1) is a 128-bit unique identifier, defined by RFC 4122, generated from the current timestamp and the physical MAC address of the device. Its design ensures global uniqueness and temporal order, making it ideal for systems needing both uniqueness and sortable identifiers.
UUID v1 Structure & Format
- Size: 128 bits (16 bytes)
- Pattern: 8-4-4-4-12 hexadecimal digits, separated by hyphens
- Example: 6ba7b810-9dad-11d1-80b4-00c04fd430c8
- Total Length: 36 characters (including hyphens)
- Version Digit: The third segment starts with '1', designating UUID version 1
- Variant Bits: The fourth segment contains reserved bits that define the UUID variant
Dissecting a UUID v1 Example
Let’s break down this sample UUID v1: 6ba7b810-9dad-11d1-80b4-00c04fd430c8
- 6ba7b810 – The low portion of the timestamp
- 9dad – The middle section of the timestamp
- 11d1 – The high portion of the timestamp and version number (v1)
- 80b4 – Clock sequence and variant field
- 00c04fd430c8 – The MAC address of the originating device
Benefits of UUID v1
- Perfect for chronological sorting due to time-based structure
- Guarantees uniqueness with a combination of time and MAC address
- Recommended for distributed or clustered systems that require sequentially ordered IDs or logs
- Ensures compatibility with legacy applications that specifically require UUID v1
Popular Uses for UUID v1
- Event and transaction logging across distributed systems
- Detailed audit trails and immutable historical records
- Database primary keys that need embedded timestamps
- Legacy applications that are built to use UUID v1
- Any system needing easily sortable, globally unique identifiers
Privacy & Security Notes
UUID v1 encodes both the device MAC address and generation timestamp, which can reveal information about the device and the exact moment the UUID was created. For privacy-sensitive features or user-facing applications, consider alternatives to UUID v1.