5a82f65b-9a1b-41b1-af1b-c9df802d15db May 2026

"Understanding UUID 5a82f65b-9a1b-41b1-af1b-c9df802d15db: Structure, Use Cases, and Security Implications"

Given that the identifier is Version 4, the bits not used for version and variant metadata are filled with random data.

Total Bit Count: 128 bits.

Fixed Bits (Overhead):

Random Bits (Entropy):

This means the probability of generating this specific identifier was $1$ in $2^122$, or approximately $1$ in $5.3 \times 10^36$.

| Part | Value | Meaning | |------|-------|---------| | time_low | 5a82f65b | First 32 bits (timestamp part) | | time_mid | 9a1b | Next 16 bits | | version + time_high | 41b1 | Version (4) = random UUID; 1b1 = timestamp high | | variant + clock_seq | af1b | Variant bits (10xx = RFC 4122) + clock sequence | | node | c9df802d15db | 48-bit node ID (MAC or random) | 5a82f65b-9a1b-41b1-af1b-c9df802d15db

Version: 4 (randomly generated)
Variant: RFC 4122 (most common)

To understand the generation source of this specific identifier, we must examine the specific bits allocated for version and variant information. Random Bits (Entropy):