Sh4mefulIP Address: 52.101.85.96 ⚠ IP Confounder
Covers 52.100-103.x.x outbound; PTR: *.outbound.protection.outlook.com
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
- Region:
- California
- City:
- San Jose
- Coordinates:
- 37.3388, -121.8916
WHOIS Information
- Network Name:
- MSFT
- CIDR:
52.112.0.0/14, 52.96.0.0/12- Owner:
- Microsoft Corporation
- Org ID:
MSFT- Address:
- One Microsoft Way, Redmond, WA 98052
- Reverse DNS:
-
mail-westusazon11020096.outbound.protection.outlook.com
Last updated: 2/5/2026
Analysis
This IP was first observed on December 18, 2024 and most recently on November 12, 2025. It has been associated with 2 failed authentication events affecting 2 messages, representing low but recurring activity. The IP belongs to MSFT (Microsoft Corporation), a network with activity associated with United States. 8 other IPs in the same /24 subnet (52.101.85.*) also appear in this dataset.
Network Topology
External Reputation Lookups
Look up this IP in external threat intelligence and reputation databases (opens in new tab):
Nearby IPs
Other IPs in the 52.101.85.0/24 range observed failing DMARC:
52.101.85.102 (3 failures), 52.101.85.99 (2 failures), 52.101.85.124 (2 failures), 52.101.85.53 (2 failures), 52.101.85.112 (1 failure), 52.101.85.113 (1 failure), 52.101.85.106 (1 failure), 52.101.85.109 (1 failure)