uuid

root@8972:~# uuid -d a666ade7-b2ab-47b5-adb2-a0381a4a7ad7
encode: STR:     a666ade7-b2ab-47b5-adb2-a0381a4a7ad7
        SIV:     221184988793728956556938137000603187927
decode: variant: DCE 1.1, ISO/IEC 11578:1996
        version: 4 (random data based)
        content: A6:66:AD:E7:B2:AB:07:B5:2D:B2:A0:38:1A:4A:7A:D7
                 (no semantics: random data only)