Miscellaneous IPv6 Addresses
To round out the discussion, two other special IPv6 addresses exist that can be commonly seen even with basic implementations of IPv6:
The unknown (unspecified) IPv6 address, ::, or all 0s
The loopback IPv6 address, ::1, or 127 binary 0s with a single 1
The unknown address (::) can be used by a host when its own IPv6 address is not yet known or when the host wonders if its own IPv6 address may have problems. For instance, hosts use the unknown address during the early stages of dynamically discovering their IPv6 address. ...
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