UUID Generator

Generateur d'identifiants uniques universels (UUID/GUID).

Generer des UUIDs

Version :

Quantite :

Format :

Analyser un UUID

UUID a analyser :

UUIDs speciaux

Nil UUID	`00000000-0000-0000-0000-000000000000`
Max UUID	`ffffffff-ffff-ffff-ffff-ffffffffffff`

Versions UUID

Version	Nom	Description
v1	Time-based	Timestamp 100ns + adresse MAC
v2	DCE Security	Comme v1 + identifiants POSIX
v3	Name-based MD5	Hash MD5 d'un namespace + nom
v4	Random	122 bits aleatoires
v5	Name-based SHA-1	Hash SHA-1 d'un namespace + nom
v6	Reordered Time	v1 reordonne (tri lexicographique)
v7	Unix Timestamp	Timestamp Unix + aleatoire

Structure

550e8400-e29b-41d4-a716-446655440000
    |       |    |    |       |
    |       |    |    |       +-- Node (48 bits)
    |       |    |    +---------- Clock Seq (14 bits) + Variant (2 bits)
    |       |    +--------------- Version (4 bits)
    |       +-------------------- Time High (16 bits)
    +---------------------------- Time Low (32 bits) + Time Mid (16 bits)

Bits de version et variante

xxxxxxxx-xxxx-Mxxx-Nxxx-xxxxxxxxxxxx
              |    |
              |    +-- N = Variante (8, 9, a, b pour RFC 4122)
              +------- M = Version (1, 2, 3, 4, 5)

Generation en CLI

# Linux (uuidgen)
uuidgen
uuidgen -r  # Random (v4)
uuidgen -t  # Time-based (v1)

# Python
python -c "import uuid; print(uuid.uuid4())"

# PowerShell
[guid]::NewGuid()
New-Guid

# Node.js
node -e "console.log(require('crypto').randomUUID())"