Valid UUID v4
- Input
- 550e8400-e29b-41d4-a716-446655440000
- Expected output
- Válido, v4, variante RFC 4122
Hex 4 at position 13 indicates version 4 (random).
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validate uuid online
Validating UUIDs is essential in APIs and distributed systems: a malformed UUID in a REST route can cause hard-to-debug errors. This page explains how to recognise a valid UUID by the standard and how to interpret its structural fields.
Hex 4 at position 13 indicates version 4 (random).
'g' is not a valid hexadecimal digit.
A UUID v4 is a 128-bit unique identifier generated with random bits, except for the 4 version bits and 2 variant bits, which leaves 122 truly random bits. The format is xxxxxxxx-xxxx-4xxx-yxxx-xxxxxxxxxxxx, where the version digit is always 4 and y is 8, 9, a or b.
UUID v1 is based on timestamp + MAC address, ensuring temporal ordering but exposing hardware information. UUID v4 is fully random, more private but without intrinsic ordering. For databases with many inserts, UUID v7 (timestamp-based, RFC 9562) offers the best of both worlds.
No. It helps explain the scenario and use the tool more safely, but real decisions should consider official sources, full context and qualified guidance when needed.