| Date | IP Address |
| 2022-05-24 | 52.3.219.165 (ClassC) |
| 2024-05-15 | 34.238.231.105 (ClassC) |
| 2024-09-28 | 44.218.164.51 (ClassC) |
| 2025-02-01 | 172.66.0.145 (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 |