| Date | IP Address |
| 2019-04-02 | 84.19.169.21 (ClassC) |
| 2025-11-19 | 84.19.169.26 (ClassC) |
| Date | Domain | IP |
| mail10.spiess-und-collegen.de | 2025-05-07 | 84.19.169.26 |
| mail01.spiess-und-collegen.de | 2025-05-11 | 84.19.169.26 |
| mail3.spiess-und-collegen.de | 2025-06-05 | 84.19.169.26 |
| mail9.spiess-und-collegen.de | 2025-05-14 | 84.19.169.26 |
| mail.spiess-und-collegen.de | 2025-06-02 | 84.19.169.26 |
| zmail.spiess-und-collegen.de | 2025-05-08 | 84.19.169.26 |
| mailer.spiess-und-collegen.de | 2025-04-30 | 84.19.169.26 |
| server.spiess-und-collegen.de | 2025-05-08 | 84.19.169.26 |