UUID GENERATOR

UUID'S :: 8-4-4-16 Format

6DFD0F87-F567-5F18-A6C8F56F48316455
6DFD0F88-FE25-3133-50D10D2A120D91C7

UUID'S :: Microsoft 8-4-4-4-12 Format

6DFD0F89-9D4B-5311-8F03-9FB70D4717B8
6DFD0F8A-DB84-0CFF-F5EB-6E047FD4C6D6

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What Wikipedia has to say about UUID's

A Universally Unique Identifier is an identifier standard used in software construction, standardized by the Open Software Foundation (OSF) as part of the Distributed Computing Environment (DCE). The intent of UUIDs is to enable distributed systems to uniquely identify information without significant central coordination. Thus, anyone can create a UUID and use it to identify something with reasonable confidence that the identifier will never be unintentionally used by anyone for anything else. Information labelled with UUIDs can therefore be later combined into a single database without needing to resolve name conflicts. The most widespread use of this standard is in Microsoft's Globally Unique Identifiers (GUIDs) which implement this standard. Other significant users include Linux's ext2/ext3 filesystem, LUKS encrypted partitions, GNOME, KDE, and Mac OS X, all of which use implementations derived from the uuid library found in the e2fsprogs package.

A UUID is essentially a 16-byte (128-bit) number. In its canonical form a UUID may look like this:

550e8400-e29b-41d4-a716-446655440000

These 32 characters (exculding hyphens) occupy only 16 bytes because each hexadecimal character needs only 4 bits (half a byte, or a nibble) to specify it.

The number of theoretically possible UUIDs is therefore 2128 = 25616 or about 3.4 × 1038. This means that 1 trillion UUIDs have to be created every nanosecond for 10 billion years to exhaust the number of UUIDs.

UUIDs are documented as part of ISO/IEC 11578:1996 "Information technology -- Open Systems Interconnection -- Remote Procedure Call (RPC)" and more recently in ITU-T Rec. X.667 | ISO/IEC 9834-8:2005 (freely available). The IETF has published Proposed Standard RFC 4122 that is technically equivalent with ITU-T Rec. X.667 | ISO/IEC 9834-8.