| Date | IP Address |
| 2016-12-05 | 23.21.52.24 (ClassC) |
| 2017-12-13 | 23.21.145.150 (ClassC) |
| 2018-02-22 | 23.21.74.117 (ClassC) |
| 2024-07-22 | 54.91.6.89 (ClassC) |
| 2025-11-11 | 3.33.161.45 (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 |