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IPv6 ULA Generator Guide

About this tool

Generate a random IPv6 unique local address prefix in fd00::/8, following RFC 4193, for a network that should never be routed on the public internet.

Questions

What is the difference between fc00::/7 and fd00::/8?
The whole range is fc00::/7. The fd00::/8 half is where the 40-bit global ID is generated locally rather than assigned by a registry, which is the practical choice.