EXPERT RESPONSE
No they do not. Many companies in fact use addresses out of the 10 range but subnet them like a Class C address depending on the requirements of their networks.
With IPv6 there are no private address ranges defined anymore. NAT is something we should get rid of because it breaks the end-to-end model. With IPv6 there are new address types used. For instance you could use the link-local or site-local IPv6 address for internal communication that doesn't have to be routed to the Internet.
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