iP or domain name lookup

signup.duo.com Server iP：

Current resolution：

domain resolution record：

2019-05-22-----2024-08-03 172.217.160.115

2019-05-27-----2024-08-03 172.217.160.83

2021-08-14-----2024-08-03 142.251.43.19

2021-08-27-----2024-08-03 142.251.42.243

2021-11-17-----2024-08-03 172.217.163.51

2024-07-05-----2024-08-03 172.217.27.51

2024-05-17-----2024-07-31 142.250.217.115

2024-07-31-----2024-07-31 142.251.33.83

2024-07-31-----2024-07-31 142.250.217.83

2024-07-31-----2024-07-31 142.250.197.83

2024-07-31-----2024-07-31 142.250.71.211

2020-11-01-----2024-06-18 64.233.188.121

2020-12-12-----2024-06-18 64.233.189.121

2021-01-25-----2024-06-18 108.177.97.121

2021-01-27-----2024-06-18 108.177.125.121

2021-02-09-----2024-06-18 74.125.203.121

2021-02-09-----2024-06-18 74.125.204.121

2021-11-19-----2024-06-18 172.217.24.243

2024-05-17-----2024-06-18 142.250.157.121

2024-06-18-----2024-06-18 142.251.170.121

2024-06-18-----2024-06-18 173.194.174.121

2024-06-18-----2024-06-18 142.251.8.121

2024-06-18-----2024-06-18 64.233.187.121

2021-02-09-----2024-05-17 74.125.23.121

2024-05-17-----2024-05-17 142.251.220.83

2024-05-17-----2024-05-17 142.251.211.243

2024-05-17-----2024-05-17 142.251.220.115

2024-04-04-----2024-04-04 172.217.18.19

2024-04-04-----2024-04-04 172.253.118.121

2024-04-04-----2024-04-04 142.250.176.19

2024-04-04-----2024-04-04 142.251.42.147

2023-08-05-----2023-11-14 142.250.189.243

2023-11-14-----2023-11-14 142.250.196.115

2023-11-14-----2023-11-14 172.217.16.211

2023-11-14-----2023-11-14 74.125.200.121

2021-10-23-----2023-08-05 142.251.10.121

2023-08-05-----2023-08-05 172.217.174.115

2023-08-05-----2023-08-05 142.250.186.115

2021-12-19-----2023-06-16 142.250.207.83

2023-06-16-----2023-06-16 142.251.12.121

2022-07-03-----2022-07-03 172.217.31.19

2021-09-24-----2022-01-15 142.250.204.115

2021-11-19-----2022-01-15 142.250.66.147

2019-05-22-----2021-12-20 172.217.25.19

2017-01-04-----2021-11-26 172.217.24.19

2021-02-15-----2021-11-26 142.250.199.83

2017-01-04-----2021-11-25 172.217.27.147

2017-01-04-----2021-11-25 216.58.200.51

2019-05-22-----2021-11-25 172.217.31.243

2021-09-24-----2021-11-25 142.250.66.51