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IPv6 ULA Generator

Generate Unique Local Addresses for private IPv6 networks — random 40-bit global IDs in fc00::/7 space, no coordination needed.

100% Local Browser Native

How to Use the IPv6 ULA Generator

1. Set options

Adjust the settings for IPv6 ULA first.

2. Generate

Create your IPv6 ULA with one click.

3. Copy and reuse

Copy the result into your project; generate again for alternatives.

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Frequently Asked Questions

What is a ULA?

Unique Local Address — private IPv6 space (fc00::/7) for internal networks, like 192.168.x.x for IPv4.

ULA vs link-local?

Link-local (fe80::/10) works on one link only; ULAs route across your whole organization.

How is the global ID made?

40 random bits — generated once per site, practically guaranteed unique without coordination.

How is each address assembled?

8 random bytes from getRandomValues: group 1 is forced to fd, every byte is hexed with 2-digit padding, joined and regrouped into 4-hex-letter blocks, shortened once via (:0)+: to ::, plus a Subnet row of fdXX:XXXX:XXXX::/48.

Is my input uploaded anywhere?

No — generation runs locally in your browser, free with no signup.

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Last updated October 2026