Interprete a UUID

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Your input:                      51a04a28-c701-8216-87e9-5ce32bd83b97

Various notations:

URN:                             urn:uuid:51a04a28-c701-8216-87e9-5ce32bd83b97
URI:                             uuid:51a04a28-c701-8216-87e9-5ce32bd83b97
Microsoft GUID syntax:           {51A04A28-C701-8216-87E9-5CE32BD83B97}
C++ struct syntax:               { 0x51a04a28, 0xc701, 0x8216, { 0x87, 0xe9, 0x5c, 0xe3, 0x2b, 0xd8, 0x3b, 0x97 } }

As OID (ISO/ITU-T 128 bits):     2.25.108499739284970269123490014110087134103
As OID (Microsoft):              1.2.840.113556.1.8000.2554.20896.18984.50945.33302.34793.6087467.14171031
As OID (Waterjuice 2x64 bits):   1.3.6.1.4.1.54392.1.5881782652343779862.9793460995456777111
As OID (Waterjuice 4x32 bits):   1.3.6.1.4.1.54392.2.1369459240.3338764822.2280217827.735591319
As OID (Waterjuice 8x16 bits):   1.3.6.1.4.1.54392.3.20896.18984.50945.33302.34793.23779.11224.15255

Interpretation of the UUID:

Variant:                         [0b10_] RFC 9562 (Davis-Peabody-Leach)
Version:                         [0x8] Custom implementation
Custom data:                     [0x51a04a28c70121607e95ce32bd83b97]
Custom data block1 (32 bit):     [0x51a04a28]
Custom data block2 (16 bit):     [0xc701]
Custom data block3 (12 bit):     [0x216]
Custom data block4 (14 bit):     [0x07e9]
Custom data block5 (48 bit):     [0x5ce32bd83b97]

Interpretation of HickelSOFT "SQL Server Sortable Custom UUID", Version 3

Random 16 bits:                  [0x51a0] 0b0101000110100000
Milliseconds:                    [0x4a] 290 (deviation -2ms..2ms)
Seconds:                         [0x28] 40
Minute of day:                   [0x01c7] 455 (07:34)
Day of year:                     [0x162] 354 (Day=20, Month=12)
Unused 2 bits:                   [0] 0b00
Year:                            [0x7e9] 2025
Signature:                       [0x5ce32bd83b97] HickelSOFT "SQL Server Sortable Custom UUID", Version 3 (very likely)
UTC Date Time:                   2025-12-20 07:34:40'290 (deviation -2ms..2ms)