Is GUID unique? While each generated GUID is not guaranteed to be unique, the total number of unique keys (2^128 or 3.4×10^38) is so large that the probability of the same number being generated twice is very small.
GUID is a 16 byte (or 128 bits) combination of alphabets and numerics. Once you take it apart, the bits of the GUID break down like this:
for a total of 128 bits.
GUID is a 16 byte (or 128 bits) combination of alphabets and numerics. Once you take it apart, the bits of the GUID break down like this:
- 60 bits of timestamp,
- 48 bits of computer identifier,
- 14 bits of uniquifier, and
- 6 bits are fixed,
for a total of 128 bits.
More information can be found here.
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