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The Devs Tools
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IPv6 ULA Generator

Generate RFC 4193 compliant IPv6 Unique Local Address (ULA) subnets and prefix allocations in real-time.

IPv6 ULA Generator

Generate an RFC 4193 Unique Local Address (ULA) block. ULAs are private addresses intended for local communications, analogous to IPv4 private ranges (like 10.0.0.0/8).

Generated Subnets

Click Generate to create a private IPv6 prefix block.

Frequently Asked Questions

What is an IPv6 ULA?
A Unique Local Address (ULA) is an IPv6 address in the block `fc00::/7` designed for local networks. The prefix `fd00::/8` is reserved for randomly generated local prefixes.
Why is the Global ID random?
RFC 4193 requires a 40-bit Global ID to be randomly generated to prevent addressing conflicts if separate local networks are merged.