| Date | IP Address |
| 2023-08-26 | 40.103.39.38 (ClassC) |
| 2024-04-12 | 40.99.155.131 (ClassC) |
| 2024-09-07 | 40.99.155.3 (ClassC) |
| 2024-11-10 | 40.99.154.131 (ClassC) |
| Date | Domain | IP |
| mail.o365.royalmailgroup.com | 2023-08-26 | 40.103.39.38 |
| o365mail.royalmailgroup.com | 2023-08-26 | 40.103.39.38 |
| webmail.royalmailgroup.com | 2023-08-26 | 40.103.38.198 |
| autodiscover.royalmailgroup.com | 2023-08-26 | 40.103.38.198 |