::/96
96-bit zero prefix denotes IPv6 addresses compatible with IPv4 protocol.
::/128 (0:0:0:0:0:0:0:0 or simply ::)
address with all zeroes makes an unspecified/unknown address, used internally in network software.
::1/128 (0:0:0:0:0:0:0:1)
loop back address refers to the local host, similar to the 127.0.0.1 local host address in the IPv4.
An application sending a packet to this address is sending that packet back to itself.
2001:db8::/32
documentation prefix: for IPv6 example addresses that indicate a sample address.
fec0::/10
site-local unicast prefix: indicates that the address is valid only within the local organization.
The usage of this prefix is discouraged by the RFC.
fc00::/7
Unique Local Address, ULA, is routed only within a set of cooperating sites/nodes.
Such addresses provide a 40-bit pseudorandom number that reduces the risk of address conflicts.
ff00::/8
multicast: the address is automatically understood to be a multicast address.
fe80::/10
link-local unicast prefix signifies that the address is valid only inside the local physical link.
For use during auto-configuration and when no routers are involved.
