To identify IPv6 localhost, you can use the command `ip addr show dev lo` in your terminal or command prompt. This command will display information about the loopback interface, which is the interface that allows your computer to communicate with itself.

In the output of the command, look for the line that starts with `inet6`. This line will contain the IPv6 address of your localhost. It will be in the format `fe80::/12` or `::1`. The `fe80::/12` address is the link-local address, which is used to identify the localhost on the same network segment. The `::1` address is the unicast address, which can be used to identify the localhost from other networks.

Alternatively, you can use the command `ip -6 addr show dev lo` to display only the IPv6 addresses of the loopback interface.

You can also use the command `hostname -I` or `host -I` to print the IPv6 address of your localhost.

In addition, you can use online tools such as whatismyip.akamaitech.com or ipchicken.com to check your public IPv6 address.

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