UUID v1 Generator

Generate RFC 9562 version 1 UUIDs from a Gregorian 100-nanosecond timestamp, clock sequence, and 48-bit node identifier.

Description

Create the RFC UUID time and node form and display its canonical lowercase identifier.

UUID v1 combines a 60-bit count of 100-nanosecond intervals since 1582, a clock sequence, and a 48-bit node value. Supplying an actual network MAC can expose hardware identity, so the default node is randomized. UUID text contains 32 hexadecimal digits grouped with hyphens, but the version and variant bits assign meaning to parts of the 128-bit value.^[1]

When to use UUID v1 Generator

Use UUID v1 Generator only when its identity, ordering, privacy, or compatibility properties match the receiving system. Choosing a UUID version is part of the data model, not merely a formatting preference.

How UUID v1 Generator works

How the UUID v1 function processes input

Encode the entered text as UTF-8 bytes.
Process the bytes with the selected algorithm and its exact parameters.
Render the result in the canonical textual form shown by the tool.

Limitations and assumptions

UUID uniqueness depends on following the version's generation rules and on the quality of its time, namespace, node, or random inputs.
Time- and node-based forms can disclose metadata; use randomized node values when hardware identity should remain private.
UUIDs are identifiers, not secrets, passwords, signatures, or proof that an object exists.

Alternative or Complementary approaches

Use UUID v4 for opaque random identifiers, UUID v5 for reproducible namespace/name identifiers, or UUID v7 for time-ordered database keys.

References

RFC 9562: Universally Unique IDentifiers (UUIDs) — Internet Engineering Task Force

Similar or alternative tools

UUID Parser
Inspect a UUID's version, variant, kind, and available embedded fields.
UUID Validator
Check canonical UUID syntax and report its version nibble.