IPv6 ULA Generator

Runs in your browser — nothing is uploaded

/48 site prefix

Subnet ID (16-bit hex, 0000–ffff)

/64 subnet

Example full address (random interface ID)

About this tool

Generates an RFC 4193 Unique Local Address prefix — the IPv6 equivalent of RFC 1918 private ranges (like 10.0.0.0/8) for numbering a private network that will never route on the public internet. Uses a cryptographically random 40-bit Global ID, which RFC 4193 treats as having negligible collision probability.

Frequently asked questions

What is IPv6 ULA Generator?

Generate an RFC 4193 Unique Local Address prefix for private IPv6 numbering. It is one of the Network Tools tools on MyCodeTips.

How do I use IPv6 ULA Generator?

Open the tool, enter or paste your input, and the result appears right away. Use the Copy button to copy it.

Is IPv6 ULA Generator free to use?

Yes. It is free to use and does not need an account.

Is my data safe with IPv6 ULA Generator?

Yes. It runs entirely in your browser, so what you enter is never uploaded to our servers.

Can I share my result?

Yes. Use the share buttons below the tool to post a link or copy a link to the tool page.