Interpret a UUID

Back

UUID: 
Your input:                      a51b991f-6c04-8e01-87ea-5ce32bd83b97

Various notations:

URN:                             urn:uuid:a51b991f-6c04-8e01-87ea-5ce32bd83b97
URI:                             uuid:a51b991f-6c04-8e01-87ea-5ce32bd83b97
Microsoft GUID syntax:           {A51B991F-6C04-8E01-87EA-5CE32BD83B97}
C++ struct syntax:               { 0xa51b991f, 0x6c04, 0x8e01, { 0x87, 0xea, 0x5c, 0xe3, 0x2b, 0xd8, 0x3b, 0x97 } }

As OID (ISO/ITU-T 128 bits):     2.25.219465917017863843391132597649193581463
As OID (Microsoft):              1.2.840.113556.1.8000.2554.42267.39199.27652.36353.34794.6087467.14171031
As OID (Waterjuice 2x64 bits):   1.3.6.1.4.1.54392.1.11897271200864570881.9793742470433487767
As OID (Waterjuice 4x32 bits):   1.3.6.1.4.1.54392.2.2770049311.1812237825.2280283363.735591319
As OID (Waterjuice 8x16 bits):   1.3.6.1.4.1.54392.3.42267.39199.27652.36353.34794.23779.11224.15255

Interpretation of the UUID:

Variant:                         [0b10_] RFC 9562 (Davis-Peabody-Leach)
Version:                         [0x8] Custom implementation
Custom data:                     [0xa51b991f6c04e0107ea5ce32bd83b97]
Custom data block1 (32 bit):     [0xa51b991f]
Custom data block2 (16 bit):     [0x6c04]
Custom data block3 (12 bit):     [0xe01]
Custom data block4 (14 bit):     [0x07ea]
Custom data block5 (48 bit):     [0x5ce32bd83b97]

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

Random 16 bits:                  [0xa51b] 0b1010010100011011
Milliseconds:                    [0x99] 599 (deviation -2ms..2ms)
Seconds:                         [0x1f] 31
Minute of day:                   [0x046c] 1132 (18:51)
Day of year:                     [0x01e] 30 (Day=30, Month=1)
Unused 2 bits:                   [0] 0b00
Year:                            [0x7ea] 2026
Signature:                       [0x5ce32bd83b97] HickelSOFT "SQL Server Sortable Custom UUID", Version 3 (very likely)
UTC Date Time:                   2026-01-30 18:51:31'599 (deviation -2ms..2ms)