Sh4mefulNetwork: MSFT
Differentiating between Office 365, including email protection services, and Azure (public cloud) when diagnosing incidents is challenging because they utilize shared Microsoft-owned IP ranges. Most of this is probably O365/Outlook or Defender protection breaking DKIM and SPF authentication. Disambiguation is a work-in-progress.
This page shows DMARC authentication failures originating from the MSFT network. Learn more about this data.
Analysis
This network has contributed 2,344 unique IP addresses across 3,139 failed authentication events, accounting for 3,269 messages. Activity from this network spans from March 12, 2024 to March 24, 2026. Activity from MSFT (Microsoft) has been observed from 15 countries, including Australia, Austria, Canada.
Failures Detected from this Network
Showing 1-50 of 3,139 (failures, affecting 3,269 messages)| Date âŧ | Source IP | Country | Messages |
|---|---|---|---|
| 3/24/2026 | US | 1 | |
| 3/24/2026 | US | 1 | |
| 3/13/2026 | US | 1 | |
| 3/12/2026 | US | 1 | |
| 3/10/2026 | US | 1 | |
| 3/5/2026 | IN | 1 | |
| 2/27/2026 | US | 1 | |
| 2/24/2026 | US | 1 | |
| 2/24/2026 | US | 1 | |
| 1/26/2026 | US | 1 | |
| 1/15/2026 | US | 1 | |
| 1/13/2026 | US | 1 | |
| 1/8/2026 | US | 1 | |
| 1/6/2026 | US | 1 | |
| 1/6/2026 | US | 1 | |
| 1/6/2026 | US | 1 | |
| 12/19/2025 | US | 1 | |
| 12/19/2025 | US | 1 | |
| 12/19/2025 | US | 1 | |
| 12/18/2025 | US | 1 | |
| 12/17/2025 | US | 1 | |
| 12/17/2025 | US | 1 | |
| 12/16/2025 | US | 1 | |
| 12/9/2025 | US | 1 | |
| 12/5/2025 | US | 1 | |
| 12/5/2025 | US | 1 | |
| 12/5/2025 | US | 1 | |
| 12/4/2025 | US | 1 | |
| 12/3/2025 | US | 1 | |
| 12/2/2025 | US | 1 | |
| 12/2/2025 | US | 1 | |
| 12/2/2025 | US | 1 | |
| 11/21/2025 | US | 1 | |
| 11/20/2025 | US | 1 | |
| 11/20/2025 | US | 1 | |
| 11/19/2025 | US | 1 | |
| 11/19/2025 | US | 1 | |
| 11/18/2025 | US | 2 | |
| 11/13/2025 | US | 1 | |
| 11/12/2025 | US | 1 | |
| 11/12/2025 | US | 1 | |
| 11/11/2025 | US | 1 | |
| 10/24/2025 | US | 1 | |
| 10/24/2025 | US | 1 | |
| 10/22/2025 | US | 1 | |
| 10/22/2025 | US | 1 | |
| 10/22/2025 | US | 1 | |
| 10/22/2025 | US | 1 | |
| 10/21/2025 | US | 1 | |
| 10/21/2025 | US | 1 |