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Are all the IPV6 address publicly addressable, does it have any Private space like IPv4 that requires NAT?

Not all the IPv6 addresses are publically addressable. Though, they do have some space equivalent to Private (internal) like you find in IPv4. If you need the private address for your internal servers or systems, you can make use of IPv6 private addressing, called ULA (Unique Local Addresses.

In IPv4 protocol, private addresses are - 10.0.0.0-10.255.255.255, 172.16.0.0-172.31.255.255, and 192.168.0.0-192.168.255.255.  Whereas in the Ipv6 protocol, the private space is fc00::/7, or usually that starts with FD.

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