Bulk UUID Generator v4 – Generate Unique GUIDs

What is a UUID?

A UUID (Universally Unique Identifier), also known as a GUID (Globally Unique Identifier) in the Microsoft ecosystem, is a 128-bit label used for information in computer systems. In its canonical textual representation, the 16 octets of a UUID are represented as 32 hexadecimal (base-16) digits, displayed in five groups separated by hyphens, in the form 8-4-4-4-12 for a total of 36 characters (32 alphanumeric characters and 4 hyphens).

Version 4 UUIDs

There are multiple versions of UUIDs, but Version 4 is by far the most commonly used. A Version 4 UUID is generated using a secure random number generator. There are exactly 2¹²² (or 5.3x10³⁶) possible v4 UUIDs. This number is so incomprehensibly massive that the chance of generating a duplicate UUID—even if you generated a billion UUIDs a second for a century—is statistically zero.

Common Uses for UUIDs

• Database Primary Keys: Unlike auto-incrementing integers (1, 2, 3), UUIDs prevent attackers from guessing the IDs of other records in your database, preventing enumeration attacks.
• Session IDs: Used as highly secure, unguessable tokens for tracking user sessions.
• Distributed Systems: Since collisions are impossible, multiple independent servers can generate records with UUIDs simultaneously without coordinating with a central database.