UUID Version 1 Generator
What a version 1 UUID is
A version 1 UUID is built from three parts: a 60-bit timestamp counting 100-nanosecond intervals since 15 October 1582, a clock sequence that guards against the clock being set backwards, and a 48-bit node ID.
The node ID in a browser
The original specification described the node ID as the machine’s MAC address. A browser has no access to one, so the node ID generated on this page is random, with the multicast bit set, the conformant way to say “this is not a hardware address”.
That matters if you were counting on the node ID to identify a machine: it does not, here or in any other browser-based generator. What it still does is keep values from separate sources apart.
When it is the right choice
Version 1 is the version you pick when something else already decided for you: an existing schema, a protocol, or a dataset whose identifiers must keep the same shape.
Why it does not sort
The timestamp is stored least significant field first, so sorting version 1 UUIDs as text does not sort them by time. Version 6 is the same information rearranged so that it does.