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I still prefer ifconfig.co, which is open-source (BSD-3), supports IPv6 as well and has a nice JSON response as well.

Others have posted alternatives, but I really like the fact that you can self host it:

This is the upstream repo:

or ifconfig.me

or ifconfig.io

This one is my favorite

Disclosure: I wrote and run ifconfig.io :)

s/Disclaimer/Disclosure/

:)