| Date | IP Address |
| 2021-02-19 | 61.221.12.60 (ClassC) |
| 2025-03-29 | 61.221.12.18 (ClassC) |
| Date | Domain | IP |
| mx20.cstmed.com.tw | 2025-02-14 | 61.221.12.18 |
| mail11.cstmed.com.tw | 2025-01-30 | 61.221.12.18 |
| mail2.cstmed.com.tw | 2025-02-16 | 61.221.12.18 |
| ns2.cstmed.com.tw | 2025-03-15 | 61.221.12.18 |
| mx2.cstmed.com.tw | 2025-01-19 | 61.221.12.18 |
| mx3.cstmed.com.tw | 2025-02-24 | 61.221.12.18 |
| mx4.cstmed.com.tw | 2025-01-10 | 61.221.12.18 |
| mx5.cstmed.com.tw | 2025-03-29 | 61.221.12.18 |
| mta.cstmed.com.tw | 2025-03-27 | 61.221.12.18 |
| posta.cstmed.com.tw | 2025-01-05 | 61.221.12.18 |
| exchange.cstmed.com.tw | 2025-03-25 | 61.221.12.18 |
| mail.comune.cstmed.com.tw | 2025-03-21 | 61.221.12.18 |
| mailin.cstmed.com.tw | 2025-02-27 | 61.221.12.18 |
| correo.cstmed.com.tw | 2025-01-31 | 61.221.12.18 |
| pop.cstmed.com.tw | 2025-01-06 | 61.221.12.18 |
| ftp.cstmed.com.tw | 2025-03-22 | 61.221.12.18 |
| postmaster.cstmed.com.tw | 2024-12-27 | 61.221.12.18 |
| gw.cstmed.com.tw | 2025-03-29 | 61.221.12.18 |
| mx.cstmed.com.tw | 2025-03-21 | 61.221.12.18 |
| a.mx.cstmed.com.tw | 2024-12-29 | 61.221.12.18 |
| mbox.cstmed.com.tw | 2025-03-18 | 61.221.12.18 |
| gateway.cstmed.com.tw | 2025-03-08 | 61.221.12.18 |