Sh4mefulIP Address: 52.103.171.8 ⚠ 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:
- JP Japan
- Region:
- Tokyo
- City:
- Tokyo
- Coordinates:
- 35.6893, 139.6899
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-japaneastazrln10221008.outbound.protection.outlook.com
Last updated: 2/5/2026
Analysis
This IP was first observed on September 18, 2024 and most recently on November 12, 2024. It has been associated with 3 failed authentication events affecting 3 messages, representing low but recurring activity. The IP belongs to MSFT (Microsoft Corporation), a network with activity associated with Japan. 6 other IPs in the same /24 subnet (52.103.171.*) 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 52.103.171.0/24 range observed failing DMARC:
52.103.171.10 (3 failures), 52.103.171.1 (2 failures), 52.103.171.11 (2 failures), 52.103.171.2 (2 failures), 52.103.171.0 (1 failure), 52.103.171.3 (1 failure)