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)

48,998

IPs (Filtered)

5,124

Networks (Filtered)

197

Messages (Filtered)

82,596

Analysis

United States has contributed 5,124 unique IP addresses across 48,998 failed authentication events, accounting for 82,596 messages across 197 networks. Activity spans from March 5, 2024 to May 13, 2026. The most active networks are AT-88-Z, UK-MICROSOFT-20060601, and MSFT.

Failures

Showing 5,501-5,510 of 48,998 failures, affecting 82,596 messages

Show Confoundersⓘ

Date ▼	Source IP	Country	City	Network	Messages
11/21/2025	35.174.145.124 ⚠	US United States	Ashburn	AT-88-Z ⓘ	2
11/21/2025	2a01:111:f403:c10c::1 ⓘ	US United States	San Antonio	UK-MICROSOFT-20060601	1
11/21/2025	40.93.1.104	US United States	San Jose	MSFT ⓘ	1
11/21/2025	35.174.145.124 ⚠	US United States	Ashburn	AT-88-Z ⓘ	1
11/21/2025	35.174.145.124 ⚠	US United States	Ashburn	AT-88-Z ⓘ	3
11/21/2025	2a01:111:f403:c001::2	US United States	San Jose	UK-MICROSOFT-20060601	1
11/21/2025	35.174.145.124 ⚠	US United States	Ashburn	AT-88-Z ⓘ	1
11/21/2025	35.174.145.124 ⚠	US United States	Ashburn	AT-88-Z ⓘ	1
11/21/2025	2a01:111:f403:c001::2	US United States	San Jose	UK-MICROSOFT-20060601	2
11/21/2025	2a01:111:f403:c107::1	US United States	Phoenix	UK-MICROSOFT-20060601	1

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Geographic Distribution (US)

Color intensity represents message volume

Top Networks in United States

Top Owners in United States