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I'm trying to make a private network with 5 computers bellow an external ADSL router with NAT, but internally I want to use IPV6. To do this I need to use private special-use IPV6 addresses, such as the well-known 192.168.x.x or 10.0.0.x IPV4 address blocks.

Does someone know what are the private IPV6 addresses for this specific use?

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Wikipedia has an article on non-routing IP addresses, which includes IPv6:

The IPv6 addressing architecture (RFC 4291) sets aside the block fe80::/10 for IP address autoconfiguration. All interfaces automatically get an address in this block; however, they are explicitly forbidden to be forwarded by routers.

If a locally routable address is needed, unique local addresses in fc00::/7 can be used for a private network.

Finally, many LANs simply use a globally-routable prefix, since the large address space removes the need for a NAT in most of the cases.

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That globally routed prefix should be provided by an internet provider though. Don't just pick a random one. If you want that, use ULA (unique local addresses). Also see sixxs.net/tools/grh/ula –  Sander Steffann Feb 23 '12 at 20:41

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