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
Does a similar job
all alternatives →
128-bit, roughly-ordered, URL-safe UUIDs2021 · github.com · ▲205Timeflake is a 128-bit, roughly-ordered, URL-safe UUID. - anthonynsimon/timeflake
Go library for concise, unambiguous and URL-safe UUIDs2015 · github.com · ▲50A generator library for concise, unambiguous and URL-safe UUIDs - lithammer/shortuuid
CuteUID – Generate Cute UIDs2019 · github.com · ▲119😊 Generate cute UIDs. Contribute to alexandriax/cuteuid development by creating an account on GitHub.
SnowId – A Decentralized, K-Ordered, 128-bit UUID library in C2022 · github.com · ▲15Sharing my project inspired by twitter snowflake UUID generator but that supports: 1) Longer range of id's to be generated. 2) No coordination with other machines in the distributed system.
UUIDs that are Shakespearean, grammatically correct sentences2020 · github.com · ▲154Generate Easy to Remember, Readable UUIDs, that are Shakespearean and Grammatically Correct Sentences 🥳 - Debdut/uuid-readable

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