auth.udacity.com Server iP：
Current resolution：
domain resolution record：
2023-01-24-----2023-09-25 104.18.5.237
2023-01-24-----2023-09-25 104.18.4.237
2022-08-31-----2022-08-31 104.18.10.116
2022-08-31-----2022-08-31 104.18.11.116
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