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by crazybigdan 1908 days ago
For what it is worth, I have found that the STUN protocol is also an option for discovering this sort of information. There are lists of public stun servers out there [0]. Finding a client is a little more difficult than just using curl, I grant, but not impossible.

[0]: https://gist.github.com/mondain/b0ec1cf5f60ae726202e