DMARC Spoof Detection, United States

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This page shows DMARC authentication failures originating from United States. Learn more about this data.

Failures (Filtered)

50,740

IPs (Filtered)

5,214

Networks (Filtered)

201

Messages (Filtered)

85,165

Analysis

United States has contributed 5,214 unique IP addresses across 50,740 failed authentication events, accounting for 85,165 messages across 201 networks. Activity spans from March 5, 2024 to July 7, 2026. The most active networks are AT-88-Z, UK-MICROSOFT-20060601, and MSFT.

Failures

Showing 8,951-8,960 of 50,740 failures, affecting 85,165 messages

Show Confoundersⓘ

Date ▼	Source IP	Country	City	Network	Messages
10/23/2025	35.174.145.124 ⚠	US United States	Ashburn	AT-88-Z ⓘ	3
10/23/2025	2a01:111:f403:c107::1	US United States	Phoenix	UK-MICROSOFT-20060601	1
10/23/2025	100.24.129.5 ⚠	US United States	Ashburn	AMAZO-4 ⓘ	1
10/23/2025	2a01:111:f403:c007::2 ⓘ	US United States		UK-MICROSOFT-20060601	1
10/23/2025	2a01:111:f403:c000::1	US United States	San Jose	UK-MICROSOFT-20060601	1
10/23/2025	34.210.15.192 ⚠	US United States	Boardman	AT-88-Z ⓘ	2
10/23/2025	2a01:111:f403:c105::7	US United States	Chicago	UK-MICROSOFT-20060601	1
10/23/2025	40.93.1.105	US United States	San Jose	MSFT ⓘ	2
10/23/2025	64.78.34.78 ⚠	US United States		INTRMD-1	1
10/23/2025	204.232.250.38	US United States		RSCP-NET-4	1

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Geographic Distribution (US)

Color intensity represents message volume

Top Networks in United States

Top Owners in United States