| Date | IP Address |
| 2019-09-21 | 34.195.119.45 (ClassC) |
| 2019-09-21 | 52.5.120.69 (ClassC) |
| 2020-05-19 | 35.170.252.32 (ClassC) |
| 2020-05-19 | 18.214.174.224 (ClassC) |
| 2021-01-19 | 52.4.46.123 (ClassC) |
| 2024-09-19 | 54.91.59.199 (ClassC) |
| 2025-02-01 | 35.71.131.46 (ClassC) |
| 2025-09-06 | 13.248.144.105 (ClassC) |
| 2025-09-22 | 3.33.148.61 (ClassC) |
| 2025-10-30 | 13.248.241.119 (ClassC) |
| Date | Domain | IP |
| api.unpaywall.org | 2024-02-22 | 54.157.58.70 |
| analytics.unpaywall.org | 2024-09-19 | 54.91.59.199 |
| support.unpaywall.org | 2024-05-15 | 34.238.231.105 |