RFC1918 equiv

[Chuck Yerkes]

I know this was answered but a tragic disk death has taken
away a lot of mail archives.

I'm at a place that needs to start using IPv6, but isn't ready
to try 6-bone.  We need to setup a router/prefix advertising
daemon and, therefore, need a prefix to offer the machines.
I could make something up, but I've recovered too many companies
from that in IPv4 land.

What is an appropriate prefix to use for a non-routable IPv6
network?  The moral equivalent of 10/8 or 192.168/16?

Thanks

chuck yerkes