| Date | IP Address |
| 2025-01-04 | 222.231.28.18 (ClassC) |
| Date | Domain | IP |
| mail2.hdpros.co.kr | 2024-07-20 | 222.231.28.18 |
| smtp3.hdpros.co.kr | 2024-10-07 | 222.231.28.18 |
| mx7.hdpros.co.kr | 2025-01-04 | 222.231.28.18 |
| exchange.hdpros.co.kr | 2024-10-23 | 222.231.28.18 |
| spam.hdpros.co.kr | 2024-08-26 | 222.231.28.18 |
| imap.hdpros.co.kr | 2024-09-23 | 222.231.28.18 |
| pop.hdpros.co.kr | 2024-09-09 | 222.231.28.18 |
| server.hdpros.co.kr | 2024-09-26 | 222.231.28.18 |
| post.hdpros.co.kr | 2024-09-17 | 222.231.28.18 |
| mailout.hdpros.co.kr | 2024-09-16 | 222.231.28.18 |