https://edoverflow.com/2017/ruby-resolv-bug/
https://github.com/jtdowney/private_address_check/commit/58a0d7fe31de339c0117160567a5b33ad82b46af
https://github.com/jtdowney/private_address_check/issues/1
https://hackerone.com/reports/287245
https://hackerone.com/reports/287835
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