Sh4mefulIP Address: 2a01:111:f403:4f::205 ⚠ IP Confounder
⚠ IP Confounder Detected: Microsoft 365 Exchange Online Protection (EOP)
Exchange Online Protection (EOP) is a cloud-based email filtering service included with all Microsoft 365 subscriptions to protect against spam, malware, and phishing attacks. It automatically secures mailboxes by filtering incoming and outgoing messages in real-time using anti-spam, anti-malware, and content filters. During periods of active campaign activity, these can largely be ignored (esp. when recipients are on Exchange). However, forged emails have been observed from Microsoft infrastructure that have this signature too.
Exchange Online Protection (EOP) is a cloud-based email filtering service included with all Microsoft 365 subscriptions to protect against spam, malware, and phishing attacks. It automatically secures mailboxes by filtering incoming and outgoing messages in real-time using anti-spam, anti-malware, and content filters. During periods of active campaign activity, these can largely be ignored (esp. when recipients are on Exchange). However, forged emails have been observed from Microsoft infrastructure that have this signature too.
This page shows DMARC authentication failure data for this IP address. Learn more about this data.
Geolocation Information
- Country:
- AT Austria
- Region:
- Vienna
- City:
- Vienna
- Coordinates:
- 48.2049, 16.3662
WHOIS Information
- Network Name:
- UK-MICROSOFT-20060601
- Owner:
- ORG-MA42-RIPE
- Reverse DNS:
-
mail-vi1eur05lp20205.outbound.protection.outlook.com
Last updated: 2/5/2026
Analysis
This IP was first observed on February 14, 2025 and most recently on September 24, 2025. It has been associated with 3 failed authentication events affecting 3 messages, representing low but recurring activity. The IP belongs to UK-MICROSOFT-20060601 (ORG-MA42-RIPE), a network with activity associated with Austria.
External Reputation Lookups
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