| Date | IP Address |
| 2025-05-13 | 104.21.80.1 (ClassC) |
| 2025-07-29 | 104.21.32.1 (ClassC) |
| 2025-10-13 | 104.21.91.125 (ClassC) |
| 2026-02-08 | 172.67.219.78 (ClassC) |
| Date | Domain | IP |
| contest-api.koi.or.kr | 2024-09-14 | 172.67.219.78 |
| contest-admin.koi.or.kr | 2025-05-13 | 104.21.80.1 |
| language-docs.koi.or.kr | 2025-03-22 | 18.161.6.35 |
| contest-ws.koi.or.kr | 2025-03-23 | 3.34.108.53 |
| contest.koi.or.kr | 2024-11-15 | 104.21.91.125 |
| www.koi.or.kr | 2024-12-06 | 172.67.219.78 |