Important IPv6 Addresses

For easy reference, I’ve listed some important IPv6 address ranges below.

0:0:0:0:0:0:0:0 – equals ::. This is equivalent to IPv4’s IP address. It is usually the source address of a host using DHCP stateful configuration and is also referred to as a non-routable meta-address used to designate an invalid, unknown, or non applicable target.
0:0:0:0:0:0:0:1 – equal to ::1. This is the equivalent of the which is the Internet protocol (IP) loopback address also referred to as the “localhost”.
0:0:0:0:0:0: – in a mixed IPv6/IPv4 network environment, an IPv4 address is appended as the last 32 bits of an IPv6 address.
2000::/3 – the global unicast address range.
FC00::/7 – the unique local unicast range.
FE80::/10 – the link local unicast range.
FF00::/8 – the multicast range.
3FFF:FFFF::/32 – reserved for examples and documentation.
2001:0DB8::/32 – also reserved for examples and documentation
2002::/16 – used with 6to4 tunneling.

As an example of implementation, 2001:0DB8:0123::/48 stands for the network with addresses 2001:0DB8:0123:0000:0000:0000:0000:0000 through 2001:0DB8:0123:FFFF:FFFF:FFFF:FFFF:FFFF.

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