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Life & fun · December 29, 2012

UUID as a Service

An interactive tour of UUIDs: what every nibble means, and how versions 1, 3, 4, 5, 6, 7 and 8 fill the 128 bits (RFC 9562).

UUID as a Service launched on December 29, 2012 with 13 votes, #106 of 501 launches that month and more than 75% of that year's launches. The site was still online in September 2026, 13 years on.

In plain words

UUID as a Service is an interactive educational tool that breaks down the structure of Universal Unique Identifiers, explaining what each bit means across versions 1, 3, 4, 5, 6, 7, and 8 according to RFC 9562. Users can explore how these 128-bit identifiers are constructed through animated visualizations and step-through tutorials. It is designed for developers and anyone curious about how UUIDs work under the hood.

written from the facts on this page · September 2026

From the sources

A UUIDv4 , the kind most tools print. Watch the fields appear, or press → to step throughfrom uuid.me

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Source: Show HN post ↗

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