Sh4mefulIP Address: 40.107.92.104 ⚠ IP Confounder
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:
- Virginia
- City:
- Boydton
- Coordinates:
- 36.6694, -78.3877
WHOIS Information
- Network Name:
- MSFT
- CIDR:
40.96.0.0/12, 40.76.0.0/14, 40.120.0.0/14, 40.80.0.0/12, 40.74.0.0/15, 40.125.0.0/17, 40.112.0.0/13, 40.124.0.0/16- Owner:
- Microsoft Corporation
- Org ID:
MSFT- Address:
- One Microsoft Way, Redmond, WA 98052
- Reverse DNS:
-
mail-bn7nam10on2104.outbound.protection.outlook.com
Last updated: 2/5/2026
Analysis
This IP was first observed on March 13, 2024 and most recently on June 18, 2025. It has been associated with 5 failed authentication events affecting 5 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 (40.107.92.*) 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 40.107.92.0/24 range observed failing DMARC:
40.107.92.129 (6 failures), 40.107.92.127 (4 failures), 40.107.92.118 (4 failures), 40.107.92.139 (4 failures), 40.107.92.100 (4 failures), 40.107.92.106 (3 failures), 40.107.92.128 (3 failures), 40.107.92.103 (3 failures)