Sh4meful DMARC Spoof Detection
IP Address: 2a01:111:f403:c201::3
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.
About this Data
▶The data here is from DMARC analysis for domains I administer, drawn from a larger dataset (comprising millions of authentication records and messages). These entries are from email attempts that failed both SPF and DKIM (and there are often alignment issues - hidden here). In many cases, these failures indicate unauthorized use of the domain name, and are commonly associated with spoofing, phishing, or other abusive mail activity.
Geolocation Information
- Country:
- NL The Netherlands
- Region:
- North Holland
- City:
- Amsterdam
- Coordinates:
- 52.3759, 4.8975
WHOIS Information
- Network Name:
- UK-MICROSOFT-20060601
- Owner:
- ORG-MA42-RIPE
- Reverse DNS:
-
mail-westeuropeazlp170110003.outbound.protection.outlook.com
Last updated: 2/5/2026
Failures Detected from this IP
Showing 1-24 of 24 (failures, affecting 43 messages)| Date ▼ | Messages |
|---|---|
| 12/20/2025 | 1 |
| 12/17/2025 | 1 |
| 11/19/2025 | 1 |
| 10/21/2025 | 2 |
| 10/4/2025 | 1 |
| 9/30/2025 | 1 |
| 9/25/2025 | 2 |
| 9/24/2025 | 1 |
| 9/12/2025 | 1 |
| 9/10/2025 | 3 |
| 9/9/2025 | 3 |
| 8/22/2025 | 4 |
| 8/6/2025 | 1 |
| 7/18/2025 | 1 |
| 7/10/2025 | 2 |
| 7/9/2025 | 2 |
| 7/3/2025 | 1 |
| 7/2/2025 | 3 |
| 6/27/2025 | 5 |
| 6/26/2025 | 1 |
| 6/4/2025 | 3 |
| 2/26/2025 | 1 |
| 2/14/2025 | 1 |
| 9/12/2024 | 1 |