What does ::1 mean?

Solution 1:

Its the loopback address in ipv6, equal to 127.0.0.1 in ipv4.

Solution 2:

::1 is the compressed format IPV6 loopback address 0:0:0:0:0:0:0:1. It is the equivalent of the IPV4 address 127.0.0.1.

If you are trying to find your machines public IP address then you can use whatsmyip.org.

If you want to know the IP address of a network interface then you would need to tell us what operating system you are using.