| Date | IP Address |
| 2013-05-26 | 81.91.83.21 (ClassC) |
| 2024-11-06 | 81.91.82.35 (ClassC) |
| Date | Domain | IP |
| mx20.bytmagazin.cz | 2024-09-02 | 81.91.82.35 |
| mail02.bytmagazin.cz | 2024-09-28 | 81.91.82.35 |
| smtp.mail.bytmagazin.cz | 2024-09-09 | 81.91.82.35 |
| newmail.bytmagazin.cz | 2024-09-07 | 81.91.82.35 |
| smtp.bytmagazin.cz | 2024-09-18 | 81.91.82.35 |
| root.bytmagazin.cz | 2024-09-27 | 81.91.82.35 |
| mailhost.bytmagazin.cz | 2024-10-13 | 81.91.82.35 |
| mailsrv.bytmagazin.cz | 2024-10-18 | 81.91.82.35 |
| mailx.bytmagazin.cz | 2024-10-31 | 81.91.82.35 |