UUID Generator & Inspector
Generate cryptographically secure UUIDv4, time-ordered UUIDv7 (RFC 9562), and UUIDv1 with custom wrappers, or inspect and decode existing UUIDs.
Technical Overview
UUID Version Differences
UUIDv4 (Random)
Generated using 122 bits of cryptographically strong pseudo-random numbers. Best for general-purpose unique identifiers and session tokens.
UUIDv7 (Time-Ordered RFC 9562)
Combines a 48-bit Unix epoch millisecond timestamp with 74 bits of entropy. Perfect for database primary keys because sequential inserts preserve B-tree index locality and prevent fragmentation.
UUIDv1 (MAC & Date)
Generated from the host MAC address and 100-nanosecond intervals since 1582. Useful for legacy system integration where device identity is needed.
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Help & answers
Frequently Asked Questions
What is a UUID?
A UUID is a 128-bit identifier formatted as eight-four-four-four-twelve hexadecimal characters. It is designed to be unique without a central coordinator, making it practical for distributed systems.
What is the difference between UUID v1, v4, and v7?
UUID v1 encodes a timestamp and MAC address. UUID v4 is fully random. UUID v7 encodes a millisecond timestamp in a sortable prefix, making it useful for database primary keys where insertion order matters.
Can I use generated UUIDs in my database or application?
Yes. UUIDs are widely used as primary keys, session tokens, and correlation IDs. UUID v4 is the most common general-purpose choice. UUID v7 is preferred when you need time-sortable keys in modern databases.
Are generated UUIDs truly unique?
UUID v4 collision is statistically negligible — roughly 1 in 5 undecillion for each new generation. For all practical purposes they are unique and safe to use without a central registry.
Important disclaimer: Alexonic Tools is completely free to use. There is no charge, and we do not save tool inputs or generated results. We value customer privacy and keep building and fixing each day. Always verify important financial, payroll, legal, tax, business, or production-code results before relying on them. If you see an issue, need a tool, or require an update, send feedback to the developer.