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IPv6 ULA generator

Generate a unique-local prefix with a secure random 40-bit global ID, optionally deriving an EUI-64 interface from a MAC.

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Using this tool

Generate a random ULA prefix for private-network planning.

Actions: Generate ULA

Example

The 40-bit global ID changes randomly; the interface ID is reproducible from this synthetic MAC. X is a placeholder.

Example action and settings

Action: Generate ULA
Subnet ID (hexadecimal): 0001
Optional MAC address: 02:00:00:12:34:56

Input / action

Result / expected behavior
fdXX:XXXX:XXXX::/48; subnet fdXX:XXXX:XXXX:0001::/64; interface ID 0000:00ff:fe12:3456 (X varies).
Available options: Subnet ID (hexadecimal) · Optional MAC address
Scope and limitations
  • The subnet ID is 1–4 hex digits; fd00::/8 is not for public Internet routing.
Common mistakes
  • Generating a prefix does not configure an interface or guarantee no collision; EUI-64 exposes MAC-derived structure.
Related tools
MAC address generator  IPv4 address converter  
Privacy and browser support
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