Sh4mefulIP Address: 2603:10b6:510:345::18 ⚠ IP Confounder
IPv6 outbound EOP (Azure-hosted)
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 failure data for this IP address. Learn more about this data.
Geolocation Information
- Country:
- US United States
- Coordinates:
- 37.751, -97.822
WHOIS Information
- Network Name:
- MSFT
- CIDR:
2603:1000::/24- Owner:
- Microsoft Corporation
- Org ID:
MSFT- Address:
- One Microsoft Way, Redmond, WA 98052
Analysis
This IP was observed on a single date: October 3, 2025. It has been associated with 1 failed authentication event affecting 1 message — a single isolated event. The IP belongs to MSFT (Microsoft Corporation), a network with activity associated with United States.
External Reputation Lookups
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