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Did you know there are lots of types of GUID (aka UUID). This special number has had a few facelifts over the years. GUIDs are globally unique identifiers or universally unique identifiers. They are used in computer systems all over the globe. One consists of 32 numbers broken up in to a sequence of hexadecimal digits (0-9 and a-f).

Version one (V1) GUIDs which have a network MAC address embedded and can be recognized by the digit '1' in the third group of digits, for example {644e1dd7-2a7f-18fb-b8ed-ed78c3f92c2b}. Version four (V4) GUIDs use a different algorithm, which is a random number. Where a '4' is in the same position (third group of digits), for example {20380a36-8777-43f7-a79e-65bdb53f4621}. Because of this pattern if a hacker knows the internal state, it is possible to generate the same GUIDs on another system.

In the Microsoft world a GUID that is not initialized has a value of {00000000-0000-0000-0000-000000000000}. And that is fine but useless. Modern Microsoft GUIDs are of V4 type.

MS SQL server can also be used to make GUIDs. Adding column of type 'uniqueidentifier' with a default value of 'newid()' will give you a brand new GUID with each row.

see code examples for making GUIDs

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