UUID v1 Generator

What is a UUID v1 Generator

A UUID v1 is built from the current timestamp (100-nanosecond units since 1582) plus a 48-bit node identifier. The time component makes v1 values naturally sortable by creation order.

The version digit is 1 and the variant bits follow RFC 4122. Historically the node ID was the MAC address of the generating machine; modern generators use a random node to avoid leaking hardware identity.

How to

1. Set how many UUIDs you need (1–1000).
2. Toggle uppercase, hyphens and braces formatting.
3. Press Generate, then copy, copy all, or export as .txt/.csv.

Use cases

• Event and log identifiers where chronological order is valuable.
• Distributed systems that want roughly time-sortable keys without a central clock.
• Replacing auto-increment IDs exposed in public URLs (avoids leaking row counts).

Structure

Layout: time_low(32) - time_mid(16) - time_hi_and_version(16) - clock_seq(16) - node(48). The first three fields carry the timestamp, so sorting by string order approximates creation order.

Compare UUID v1 Generator with other formats

Code examples

JavaScript

const { v1 } = require('uuid');
const id = v1();  // e.g. '2ed6657d-badc-11d1-1234-001631e8b748'

Python

import uuid
id = uuid.uuid1()  # embeds host ID + timestamp

Frequently asked questions