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    This comment is hidden because it contains spoiler information about the solution

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    Could someone explain to me why 1.2.3.4 is an invalid IP. As I have checked and it's is use somewhere in AUS, so I'm not sure how it should be false

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    Should maybe consider added the 1666 test case as I was looking over my solution and I noticed I would of failed if that was one of the test thou I have now fixed it. Might be the case for some other solutions as well.