UUID v6 Generator

What is a UUID v6?

A UUID v6 is a UUID v1 with its time digits reordered, highest part first, so the IDs sort by the time they were made.

It holds the same fields as v1: a 60-bit count of 100-nanosecond steps since 15 October 1582, a clock sequence and a 48-bit node ID. Only the order of the time bits changes, which makes v6 easy to convert to and from v1.

RFC 9562 says v6 should use a random node ID rather than a MAC address, and this generator does. Every ID gets a fresh random node and clock sequence, so nothing about your device goes into it.

The standard also says to prefer UUID v7 where you can. Use v6 when you have v1 IDs, or tools built around them, and want time order.

What a UUID v6 looks like

Here is the ID you just made, split into its parts. ClickTap Generate above and watch it change.

• The time it was made, highest part first, so the IDs sort by time.
• The 6 means version 6. It is always in this spot.
• This digit is always 8, 9, a or b. It marks the standard layout.
• The clock sequence, a number that guards against repeats.
• The node ID. Here it is random with the multicast bit set, not your MAC address.

Its time part says it was made at the moment you opened this page.

When to use UUID v6

Make a UUID v6 in code

import { v6 } from 'uuid';

const id = v6();
console.log(id);

import uuid

id = uuid.uuid6()
print(id)

import com.fasterxml.uuid.Generators;
import java.util.UUID;

UUID id = Generators.timeBasedReorderedGenerator().generate();
System.out.println(id);

import "github.com/google/uuid"

id, err := uuid.NewV6()
if err != nil {
	panic(err)
}
fmt.Println(id)

UUID v6 vs other versions

Questions people ask