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)

50,732

IPs (Filtered)

5,212

Networks (Filtered)

201

Messages (Filtered)

85,155

Analysis

United States has contributed 5,212 unique IP addresses across 50,732 failed authentication events, accounting for 85,155 messages across 201 networks. Activity spans from March 5, 2024 to July 2, 2026. The most active networks are AT-88-Z, UK-MICROSOFT-20060601, and MSFT.

Failures

Showing 8,191-8,200 of 50,732 failures, affecting 85,155 messages

Show Confoundersⓘ

Date ▼	Source IP	Country	City	Network	Messages
11/14/2025	35.174.145.124 ⚠	US United States	Ashburn	AT-88-Z ⓘ	2
11/14/2025	2a01:111:f403:e00e::	US United States	San Antonio	UK-MICROSOFT-20060601	1
11/14/2025	35.174.145.124 ⚠	US United States	Ashburn	AT-88-Z ⓘ	2
11/14/2025	2a01:111:f403:e001::1	US United States	San Jose	UK-MICROSOFT-20060601	1
11/14/2025	35.174.145.124 ⚠	US United States	Ashburn	AT-88-Z ⓘ	1
11/14/2025	35.174.145.124 ⚠	US United States	Ashburn	AT-88-Z ⓘ	2
11/14/2025	2a01:111:f403:c001::2	US United States	San Jose	UK-MICROSOFT-20060601	1
11/14/2025	2a01:111:f403:c101::7	US United States	Washington	UK-MICROSOFT-20060601	1
11/14/2025	2a01:111:f403:c001::2	US United States	San Jose	UK-MICROSOFT-20060601	1
11/14/2025	35.174.145.124 ⚠	US United States	Ashburn	AT-88-Z ⓘ	1

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Geographic Distribution (US)

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Top Networks in United States

Top Owners in United States