UUID v1 Generator

A UUID v1 is a 128-bit identifier built from a 60-bit timestamp (counted in 100-nanosecond intervals since October 15, 1582, the start of the Gregorian calendar) combined with a node value that was originally a network card's MAC address. First standardized in 1997, it's the oldest UUID version, often called the 'original UUID'.

No. Browsers can't read a real MAC address, so following RFC 4122 this tool fills the node field with random bits and sets the multicast bit to mark it as not a real hardware address. That means the value alone can't be traced back to a specific device.

UUID v1 exposes the creation time and node info directly in the value, UUID v4 is fully random, and UUID v7 also encodes time but skips the node field, filling the rest randomly instead. Use v4 if you want to avoid exposing time information, or v7 if you want both sortable ordering and better privacy — that's the more common recommendation today.

Yes. The first 60 bits give a 100-nanosecond-precision timestamp, so you can recover the creation time far more precisely than with other versions — though that same precision can be a privacy drawback.

Yes. Hyphens are just readability separators, so removing them doesn't change the underlying 32-character hex value.

No. Every UUID is generated on the spot in your browser and is never sent to or stored on a server.