| Date | IP Address |
| 2021-03-05 | 104.198.184.119 (ClassC) |
| 2026-02-16 | 199.16.172.182 (ClassC) |
| Date | Domain | IP |
| smtp01.castlewindows.com | 2026-02-16 | 199.16.172.182 |
| mail2.castlewindows.com | 2026-02-16 | 199.16.172.182 |
| mail3.castlewindows.com | 2026-02-16 | 199.16.172.182 |
| mail6.castlewindows.com | 2026-02-16 | 199.16.172.182 |
| poczta.castlewindows.com | 2026-02-16 | 199.16.172.182 |
| mvideo.castlewindows.com | 2026-02-16 | 199.16.172.182 |
| correo.castlewindows.com | 2026-02-16 | 199.16.172.182 |
| po.castlewindows.com | 2026-02-16 | 199.16.172.182 |
| pop.castlewindows.com | 2026-02-16 | 199.16.172.182 |
| mailhost.castlewindows.com | 2026-02-16 | 199.16.172.182 |
| mailgw.castlewindows.com | 2026-02-16 | 199.16.172.182 |
| relay.castlewindows.com | 2026-02-16 | 199.16.172.182 |