DOCMAC generator

This page generates a unique DOCMAC IPv6 address for your network adapter. The address is guaranteed to neither appear on the internet, nor conflict with any other address unless a duplicate MAC exists in your network, but then you have other problems.
This address fools the system into believing it has IPv6 without having IPv6.
Just enter the MAC address of your network adapter to get your unique IPv6 address. The MAC segments can be separated by whitespace, any of .:-_, or not at all.

Further explanation can be found here

DOCRND generator

DOCRND is a related implementation of DOCMAC, but using a random number generator instead of a MAC address. The number of segments left as zero can be supplied to shorten the address notation.