| Date | IP Address |
| 2021-02-20 | 61.221.12.60 (ClassC) |
| 2026-02-02 | 61.221.12.18 (ClassC) |
| Date | Domain | IP |
| mail10.cstmed.com.tw | 2025-05-03 | 61.221.12.18 |
| mx10.cstmed.com.tw | 2025-04-24 | 61.221.12.18 |
| mx20.cstmed.com.tw | 2025-02-14 | 61.221.12.18 |
| mail01.cstmed.com.tw | 2025-05-05 | 61.221.12.18 |
| mail11.cstmed.com.tw | 2025-05-03 | 61.221.12.18 |
| mx1.cstmed.com.tw | 2025-05-03 | 61.221.12.18 |
| mx02.cstmed.com.tw | 2025-11-21 | 61.221.12.18 |
| mail2.cstmed.com.tw | 2025-05-01 | 61.221.12.18 |
| ns2.cstmed.com.tw | 2025-04-30 | 61.221.12.18 |
| mx2.cstmed.com.tw | 2025-04-27 | 61.221.12.18 |
| mx3.cstmed.com.tw | 2025-04-24 | 61.221.12.18 |
| mx4.cstmed.com.tw | 2025-05-04 | 61.221.12.18 |
| mx5.cstmed.com.tw | 2025-05-03 | 61.221.12.18 |
| barracuda.cstmed.com.tw | 2026-02-02 | 61.221.12.18 |
| mta.cstmed.com.tw | 2025-04-29 | 61.221.12.18 |
| posta.cstmed.com.tw | 2025-05-16 | 61.221.12.18 |
| exchange.cstmed.com.tw | 2025-07-26 | 61.221.12.18 |
| comune.cstmed.com.tw | 2025-05-10 | 61.221.12.18 |
| mail.comune.cstmed.com.tw | 2025-11-04 | 61.221.12.18 |
| mailgate.cstmed.com.tw | 2026-01-29 | 61.221.12.18 |
| mailin.cstmed.com.tw | 2025-05-03 | 61.221.12.18 |
| correo.cstmed.com.tw | 2026-02-02 | 61.221.12.18 |
| imap.cstmed.com.tw | 2026-02-02 | 61.221.12.18 |
| pop.cstmed.com.tw | 2025-04-25 | 61.221.12.18 |
| ftp.cstmed.com.tw | 2025-11-15 | 61.221.12.18 |
| mailer.cstmed.com.tw | 2025-06-28 | 61.221.12.18 |
| postmaster.cstmed.com.tw | 2026-02-02 | 61.221.12.18 |
| hermes.cstmed.com.tw | 2025-06-13 | 61.221.12.18 |
| mxs.cstmed.com.tw | 2025-04-23 | 61.221.12.18 |
| gw.cstmed.com.tw | 2025-04-24 | 61.221.12.18 |
| mailgw.cstmed.com.tw | 2025-05-02 | 61.221.12.18 |
| mx.cstmed.com.tw | 2025-11-15 | 61.221.12.18 |
| a.mx.cstmed.com.tw | 2025-04-24 | 61.221.12.18 |
| mailbox.cstmed.com.tw | 2025-06-12 | 61.221.12.18 |
| mbox.cstmed.com.tw | 2025-05-03 | 61.221.12.18 |
| gateway.cstmed.com.tw | 2025-04-24 | 61.221.12.18 |