| Date | IP Address |
| 2021-01-26 | 64.125.77.80 (ClassC) |
| 2025-04-26 | 104.22.70.217 (ClassC) |
| 2025-06-10 | 172.67.21.9 (ClassC) |
| 2025-06-19 | 104.22.71.217 (ClassC) |
| 2025-08-23 | 104.20.29.217 (ClassC) |
| 2026-02-11 | 172.66.171.126 (ClassC) |
| Date | Domain | IP |
| mail1.kosu.org | 2024-10-08 | 104.22.71.217 |
| relay2.kosu.org | 2024-10-09 | 104.22.71.217 |
| mail7.kosu.org | 2025-04-25 | 104.22.71.217 |
| mx7.kosu.org | 2025-05-06 | 104.22.71.217 |
| poczta.kosu.org | 2025-04-28 | 172.67.21.9 |
| exchange.kosu.org | 2025-01-16 | 104.22.70.217 |
| comune.kosu.org | 2025-04-25 | 104.22.70.217 |
| mail.comune.kosu.org | 2024-09-24 | 172.67.21.9 |
| smtp.comune.kosu.org | 2025-02-09 | 104.22.71.217 |
| email.kosu.org | 2025-04-26 | 104.22.70.217 |
| mailin.kosu.org | 2024-12-04 | 104.22.71.217 |
| imap.kosu.org | 2025-04-13 | 104.22.71.217 |
| postmaster.kosu.org | 2025-04-28 | 172.67.21.9 |
| mailhost.kosu.org | 2025-02-09 | 104.22.71.217 |
| post.kosu.org | 2025-02-03 | 104.22.71.217 |
| www.kosu.org | 2023-11-01 | 3.163.24.6 |
| box.kosu.org | 2025-02-09 | 104.22.70.217 |