| Date | IP Address |
| 2017-05-19 | 173.194.208.27 (ClassC) |
| 2026-02-08 | 37.9.175.164 (ClassC) |
| Date | Domain | IP |
| alt1.aspmx.l.google.com.ustudny.cz | 2025-08-28 | 37.9.175.164 |
| alt2.aspmx.l.google.com.ustudny.cz | 2026-02-08 | 37.9.175.164 |
| alt3.aspmx.l.google.com.ustudny.cz | 2026-01-31 | 37.9.175.164 |