UUID Generator

UUID (Universally Unique Identifier) è un identificatore standard a 128 bit usato in informatica per identificare univocamente risorse senza necessità di un'autorità centrale. È rappresentato come 32 cifre esadecimali in 5 gruppi separati da trattini.

UUID v4 è generato in modo casuale. Utilizza 122 bit casuali e 6 bit fissi che identificano la versione e la variante. La probabilità di collision è astronomicamente bassa: occorrerebbero miliardi di UUID generati al secondo per decine di anni per avere una probabilità concreta di duplicati.

Gli UUID sono ideali come chiavi primarie nei database distribuiti, identificatori di sessione, ID di transazione, nomi di file temporanei e qualsiasi contesto dove serve un ID univoco senza coordinazione centralizzata. Sono preferibili agli ID incrementali per evitare la prevedibilità.

UUID (Universally Unique Identifier) is a standard 128-bit identifier used in computing to uniquely identify resources without the need for a central authority. It is represented as 32 hexadecimal digits in 5 groups separated by hyphens.

UUID v4 is randomly generated. It uses 122 random bits and 6 fixed bits that identify the version and variant. The probability of collision is astronomically low: it would take billions of UUIDs generated per second for tens of years to have a concrete probability of duplicates.

UUIDs are ideal as primary keys in distributed databases, session identifiers, transaction IDs, temporary file names and any context where a unique ID is needed without centralised coordination. They are preferable to incremental IDs to avoid predictability.

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