Random UUID v1 Generator
Generate time-based UUID version 1 identifiers with timestamp and node components - perfect for ordered, sortable unique identifiers
[ UUID v1 Generator - Quick Summary ]
What: Time-based UUID with embedded timestamp (100-nanosecond precision since 1582) and node identifier, following RFC 4122. Generates chronologically sortable unique identifiers.
When to use: Database primary keys requiring time-based ordering, distributed systems needing sortable IDs, event tracking, audit logs where creation time matters.
Example: 550e8400-e29b-11d4-a716-446655440000
Security/Important: May expose MAC address (privacy concern). Consider UUID v7 for new projects - better sortability, no MAC exposure, modern RFC 9562 standard.
Our UUID v1 generator creates time-based universally unique identifiers using RFC 4122 standards. Generate UUID version 1 with embedded timestamps and node identifiers for chronologically sortable unique IDs. Perfect for database primary keys requiring time-based ordering, distributed systems, event tracking, and applications requiring time-ordered unique identifiers with guaranteed global uniqueness across systems.
What is UUID v1?
UUID v1 (Universally Unique Identifier version 1) is a time-based identifier defined in RFC 4122. It combines a 60-bit timestamp (100-nanosecond intervals since October 15, 1582), a 14-bit clock sequence, and a 48-bit node identifier (typically a MAC address or randomly generated value). This structure ensures both uniqueness and chronological orderability - UUIDs generated later will have higher values when sorted lexicographically, making them ideal for time-series data and chronologically ordered database records.
The format is 32 hexadecimal digits displayed in 5 groups: 8-4-4-4-12 (e.g., 550e8400-e29b-11d4-a716-446655440000). The timestamp component allows deriving the exact creation time, while the node identifier component ensures global uniqueness across machines. UUID v1 is particularly valuable in distributed systems where multiple servers generate IDs independently, and applications requiring both uniqueness guarantees and time-based sorting capabilities for efficient database indexing and event sequencing. However, for new projects, UUID v7 is recommended as it offers similar benefits with better timestamp precision and no MAC address exposure.
UUID v1 Configuration Options
Quantity (1-100 UUIDs)
Time-Based Generation
How to Generate UUID v1
[STEP 1] Set Quantity
Choose how many UUID v1 identifiers to generate (1-100). Each UUID will have a unique timestamp, ensuring sequential ordering even in bulk generation.
[STEP 2] Generate Instantly
Click EXECUTE GENERATION to create time-based UUIDs. Each identifier includes an embedded timestamp and node ID for guaranteed uniqueness and chronological sortability.
[STEP 3] Copy & Use
Click individual UUIDs to copy them instantly, or use the export buttons to download all UUIDs as TXT, CSV, or JSON for database insertion, API integration, or application configuration.
[STEP 4] Integrate
Use UUID v1 for database primary keys (sortable by creation time), distributed event IDs, audit log entries, or any application requiring both uniqueness and time-based ordering without additional timestamp columns.
UUID v1 Best Practices
- _ Privacy Consideration - UUID v1 may include MAC addresses which could expose hardware information. Modern implementations often use random node IDs instead. For privacy-sensitive applications, use UUID v4 (random) or v7 (time-ordered without MAC).
- _ Sortability - Leverage UUID v1's time-based nature for database indexes. UUIDs sort chronologically, improving query performance for time-series data without requiring separate timestamp indexes.
- _ Distributed Systems - UUID v1 excels in distributed architectures where multiple systems generate IDs independently without coordination or central ID server, thanks to node ID uniqueness.
- _ Clock Synchronization - Ensure system clocks are synchronized across distributed nodes using NTP to maintain proper chronological ordering of generated UUIDs.
- _ Migration from Sequential IDs - UUID v1 is useful when migrating from auto-increment IDs while maintaining sortability for existing queries and indexes that depend on chronological ordering.
- _ Consider v7 for New Projects - For new implementations, UUID v7 offers better timestamp precision (milliseconds in prefix), improved database index performance, and avoids MAC address exposure while maintaining sortability benefits.
UUID v1 Generation Algorithm
UUID v1 follows RFC 4122 specification, combining timestamp, clock sequence, and node ID to ensure both uniqueness and chronological ordering:
// UUID v1 Structure (128 bits total)
Algorithm: Time-Based UUID Generation
// Component Breakdown:
timestamp_low (32 bits) - Low field of timestamp
timestamp_mid (16 bits) - Middle field of timestamp
timestamp_hi_version (16 bits) - High field + version (0001)
clock_seq_variant (16 bits) - Clock sequence + variant bits
node (48 bits) - MAC address or random node ID
// Timestamp Calculation:
// 100-nanosecond intervals since UUID epoch (1582-10-15)
uuid_epoch = -12219292800 seconds (Unix epoch offset)
current_time_100ns = (current_unix_time - uuid_epoch) × 10,000,000
// Clock Sequence:
// 14-bit counter for handling clock adjustments and duplicates
// Increments when timestamp goes backwards or same timestamp reused
// Node Identifier:
// 48-bit value (MAC address or random if MAC unavailable)
// Ensures global uniqueness across distributed systems
// Format: xxxxxxxx-xxxx-1xxx-yxxx-xxxxxxxxxxxx
// where 1 = version, y ∈ {8,9,a,b} = variant
Example: 550e8400-e29b-11d4-a716-446655440000
// Properties:
Sortability: Chronological (with caveats - timestamp fields reordered)
Uniqueness: Guaranteed via timestamp + clock_seq + node
Privacy: May expose MAC address (use random node for privacy)
UUID v1 API for Developers
Generate UUID v1 identifiers programmatically using our free REST API. Time-based UUIDs with embedded timestamps for chronological sorting.
Example API calls for UUID v1:
GET /api/v1/generate/uuids?version=1&count=1- Generate single time-based UUIDGET /api/v1/generate/uuids?version=1&count=100- Bulk generation for batch operations- Response includes formatted UUIDs with timestamp components for time-series applications
All UUIDs generated with 100-nanosecond precision timestamps and unique node identifiers for guaranteed global uniqueness.
Frequently Asked Questions
What's the difference between UUID v1 and v4? ▶
Does UUID v1 expose my MAC address? ▶
Are UUID v1 identifiers sortable? ▶
Can UUID v1 collide across different machines? ▶
Should I use UUID v1 or v7 for new projects? ▶
How does UUID v1 handle clock adjustments? ▶
[ HOW TO CITE THIS PAGE ]
Generate-Random.org. (2025). Random UUID v1 Generator. Retrieved from https://generate-random.org/uuid-v1
Random UUID v1 Generator - Generate-Random.org (https://generate-random.org/uuid-v1)