IPv6 ULA Generator

Overview

The IPv6 ULA Generator follows RFC 4193 guidance, combining timestamp and MAC input to derive a unique local prefix. It outputs fdxx:xxxx:xxxx::/48 plus two /64 reference subnets for private network planning.

Key Features

• Validates MAC address input before generation.
• Generates an IPv6 ULA /48 prefix.
• Returns first and last routable /64 subnets.
• Supports per-field copy and copy-all actions.
• Runs fully in-browser without uploading input data.

Steps

1. Enter a valid MAC address, such as 20:37:06:12:34:56.
2. Click Generate to create a new ULA range.
3. Review the /48 prefix, first /64, and last /64 outputs.
4. Use Copy or Copy All to export values.

Validation Rules

• Accepts aa:bb:cc:dd:ee:ff and aa-bb-cc-dd-ee-ff formats.
• MAC must contain six hexadecimal byte groups with a consistent separator.
• The MAC is normalized to lowercase without separators before hashing.
• Each generation uses the current timestamp, so identical MAC input can yield different prefixes.

FAQ

• If MAC validation fails, check byte count, hexadecimal characters, and mixed separators.
• If Web Crypto is unavailable, retry in a modern browser.
• If copy fails, manually select and copy the output text.