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How Unique Is A UUID?

A UUID (Universally Unique Identifier), also known as a GUID, is a 128-bit integer. Since each bit can be one of two values (0 or 1), there are 2128 possible UUIDs. This number written out is

34028236692093846346337460743177000000

I’ve included other big numbers below for comparison.

Stars in the milky way 🍼
250000000000

Trees on earth 🌳
3000000000000

Stars in the universe ⭐️
1000000000000000000000000

Atoms in the human body 👷
7000000000000000000000000000

UUIDs
34028236692093846346337460743177000000

Atoms on earth 🌏
10000000000000000000000000000000000000000000000000

Ways to shuffle a deck of cards ♣️
80658175170943878571660636856403766975289505440883277824000000000000

Atoms in the universe 👽
100000000000000000000000000000000000000000000000000000000000000000000000000000000

So, how unique is a UUID? Answer: Pretty unique

Posted on 2018-01-17






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