IPv6 ULA Generator

Generate an RFC 4193 unique local IPv6 /64 subnet with a random 40-bit global ID.

IPv6 ULA Generator
Local input
Output
Processing…
About this tool

Made for the task at hand.

Create a private IPv6 network for labs, local routing, and documentation. The generator follows the RFC 4193 fd00::/8 format with a fresh random 40-bit global ID and a /64 subnet, without contacting an allocation service.

How to use

  1. Run the generator to create fresh random bytes.
  2. Review the global ID, subnet ID, and /64 network.
  3. Use the subnet in your plan and avoid collisions where networks merge.
Your work stays yours.
Tool inputs are processed locally in your browser and are never sent to KitVerse servers. Clear the workspace when using a shared device.
Common questions
Is a ULA globally routable?

No. Unique local addresses are intended for local use and are not expected to be routed on the public Internet.

Is uniqueness guaranteed?

It is probabilistic. A random 40-bit global ID makes accidental collision unlikely, but there is no central reservation or absolute uniqueness guarantee.