| Date | IP Address |
| 2015-04-12 | 89.111.166.60 (ClassC) |
| 2023-01-05 | 172.64.110.26 (ClassC) |
| 2023-01-05 | 172.64.111.26 (ClassC) |
| 2023-06-15 | 172.64.109.29 (ClassC) |
| 2025-06-04 | 172.67.131.190 (ClassC) |
| 2025-11-25 | 104.21.10.252 (ClassC) |
| Date | Domain | IP |
| userpic.codeforces.org | 2025-11-13 | 172.67.131.190 |