Free UUID Generator

RFC 4122 compliant UUID generator. Supports V1/V4/V7 with batch generation. Local processing for data privacy.

Version-1 UUID (Time-based)

Time-based UUIDs with precise timestamps and MAC addresses. Ensures chronological ordering for distributed systems.

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Generated based on 100-nanosecond precision timestamps combined with MAC addresses

Version-4 UUID (Random)

Cryptographically secure random UUIDs with 122-bit entropy. Zero collision risk, ideal for database keys.

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Uses cryptographically secure pseudo-random number generators built on 122-bit random entropy

Version-7 UUID (Time-ordered)

Time-ordered UUIDs combining timestamps with randomness. Optimized for database performance and indexing.

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Hybrid architecture combining 48-bit temporal prefix with 74-bit random suffix

Batch UUID Generator

Generate multiple UUIDs at once, supports 1-100 UUIDs, downloadable as file

Enter a number between 1 and 100 to specify the number of UUIDs to generate
Select the UUID version type to generate
Batch generated UUIDs will be displayed here...

About UUID Technology

November 2024 Technical Guide

UUID Technology Evolution: Complete Analysis from RFC 4122 to V7 Standard

Traces the technical evolution of UUID technology from the RFC 4122 standard established in 1998 to the present. In-depth analysis of Version-1's design philosophy based on MAC addresses and timestamps, Version-4's cryptographic principles of pure random generation, and Version-7's innovative architecture combining time ordering with high randomness. Comprehensive comparison of technical advantages and limitations of each version in different business scenarios through actual code examples and performance benchmarks.

UUID Versions Distributed Systems Database Design
November 2024 Performance Optimization

UUID Primary Key Performance Analysis: Optimization Strategies from B+ Tree Indexes to Distributed Databases

Based on real production environment performance test data, provides in-depth analysis of the multi-dimensional impact of UUIDs as primary keys on database systems. Detailed deconstruction of B+ tree index page split issues when facing UUID randomness, root causes of cache hit rate decline, and how to significantly improve insert performance through UUID Version-7's time-ordered characteristics. Covers specific optimization configurations and sharding strategies for mainstream databases including MySQL InnoDB, PostgreSQL, MongoDB, TiDB.

Database Performance Index Optimization Primary Key Design
November 2024 Security Practices

UUID Information Security Risk Assessment and Protection System Construction

Deeply examines potential risk points of UUIDs in modern application systems from an information security perspective. Detailed analysis of how MAC address and timestamp information that Version-1 UUIDs may leak can be maliciously used for device fingerprinting and user behavior tracking. Explores predictability risks of Version-4 random UUIDs under weak random number generators, and compliance usage strategies under privacy regulations like GDPR and CCPA. Provides enterprise-level UUID security usage standards and technical protection measures.

Information Security Privacy Protection Security Design