Interpret a UUID

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UUID: 
Your input:                      42a90840-df54-4ce8-91ca-ed0fefb38405

Various notations:

URN:                             urn:uuid:42a90840-df54-4ce8-91ca-ed0fefb38405
URI:                             uuid:42a90840-df54-4ce8-91ca-ed0fefb38405
Microsoft GUID syntax:           {42A90840-DF54-4CE8-91CA-ED0FEFB38405}
C++ struct syntax:               { 0x42a90840, 0xdf54, 0x4ce8, { 0x91, 0xca, 0xed, 0x0f, 0xef, 0xb3, 0x84, 0x05 } }

As OID (ISO/ITU-T 128 bits):     2.25.88606713289893133756164289526414672901
As OID (Microsoft):              1.2.840.113556.1.8000.2554.17065.2112.57172.19688.37322.15536111.11764741
As OID (Waterjuice 2x64 bits):   1.3.6.1.4.1.54392.1.4803379552285117672.10505469733496914949
As OID (Waterjuice 4x32 bits):   1.3.6.1.4.1.54392.2.1118373952.3746843880.2445995279.4021519365
As OID (Waterjuice 8x16 bits):   1.3.6.1.4.1.54392.3.17065.2112.57172.19688.37322.60687.61363.33797

Interpretation of the UUID:

Variant:                         [0b10_] RFC 4122 (Leach-Mealling-Salz)
Version:                         [0x4] Random
Random bits:                     01000010 10101001 00001000 01000000 11011111 01010100 ????1100 11101000
                                 ??010001 11001010 11101101 00001111 11101111 10110011 10000100 00000101
Random bytes:                    [0x42a90840df54?ce8?1caed0fefb38405]