What-The-Format?

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This looks like a UUID (Universally Unique Identifier):

48AF3152 - B5E9 - 4 E65 - 9694 - DA74788EEC26
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Binary representation

01001000101011110011000101010010101101011110100101001110011001011001011010010100110110100111010001111000100011101110110000100110

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