| Date | IP Address |
| 2024-05-30 | 13.43.158.227 (ClassC) |
| 2024-06-09 | 18.133.150.32 (ClassC) |
| 2024-09-05 | 18.168.3.115 (ClassC) |
| 2024-10-02 | 3.10.111.184 (ClassC) |
| 2024-12-28 | 18.168.6.157 (ClassC) |
| Date | Domain | IP |
| govuknotify.de-sina3.communications.national.nhs.uk | 2024-05-30 | 13.43.187.93 |
| api.de-jara8.communications.national.nhs.uk | 2024-05-30 | 13.43.158.227 |
| api.dev-nhsapp.communications.national.nhs.uk | 2024-12-27 | 3.11.121.12 |
| api.uat-letters.communications.national.nhs.uk | 2024-05-30 | 35.178.121.74 |
| govuknotify.uat-letters.communications.national.nhs.uk | 2024-05-30 | 13.42.117.209 |