Sh4mefulNetwork: AMAZO-4
This is (part of) the AWS public cloud. Some email protection services run in AWS, but it is also an attack/spam vector.
This page shows DMARC authentication failures originating from the AMAZO-4 network. Learn more about this data.
Analysis
This network has contributed 15 unique IP addresses across 410 failed authentication events, accounting for 1,043 messages. Activity spans from March 5, 2024 to June 24, 2026, with peak volume in September 2025 (98 events). The top countries by failure volume are United States (61%), Ireland (39%). The most active source IPs from this network include 100.21.157.149 (238 failures), 100.24.129.5 (224 failures), 99.80.189.20 (138 failures). Failures from AMAZO-4 (Amazon) are concentrated in two countries, which may indicate a targeted campaign or regionally hosted infrastructure.
Failures Detected from this Network
Showing 151-200 of 410 failures, affecting 1,043 messages| Date ▼ | Source IP | Country | Messages |
|---|---|---|---|
| 9/25/2025 | US | 6 | |
| 9/25/2025 | US | 3 | |
| 9/24/2025 | US | 7 | |
| 9/24/2025 | US | 7 | |
| 9/24/2025 | US | 1 | |
| 9/24/2025 | US | 1 | |
| 9/23/2025 | US | 1 | |
| 9/23/2025 | US | 1 | |
| 9/20/2025 | US | 1 | |
| 9/19/2025 | US | 1 | |
| 9/19/2025 | US | 5 | |
| 9/19/2025 | IE | 1 | |
| 9/19/2025 | IE | 1 | |
| 9/19/2025 | IE | 2 | |
| 9/18/2025 | US | 1 | |
| 9/18/2025 | US | 1 | |
| 9/17/2025 | US | 4 | |
| 9/17/2025 | US | 8 | |
| 9/17/2025 | US | 1 | |
| 9/17/2025 | IE | 1 | |
| 9/17/2025 | IE | 2 | |
| 9/16/2025 | US | 1 | |
| 9/13/2025 | US | 1 | |
| 9/13/2025 | US | 1 | |
| 9/12/2025 | US | 3 | |
| 9/12/2025 | US | 3 | |
| 9/12/2025 | IE | 1 | |
| 9/12/2025 | IE | 8 | |
| 9/11/2025 | US | 2 | |
| 9/11/2025 | US | 5 | |
| 9/10/2025 | US | 4 | |
| 9/10/2025 | US | 1 | |
| 9/10/2025 | US | 2 | |
| 9/10/2025 | US | 1 | |
| 9/10/2025 | IE | 1 | |
| 9/10/2025 | IE | 6 | |
| 9/9/2025 | US | 1 | |
| 9/5/2025 | US | 1 | |
| 9/5/2025 | US | 2 | |
| 9/3/2025 | US | 3 | |
| 9/3/2025 | US | 1 | |
| 9/3/2025 | US | 2 | |
| 9/3/2025 | IE | 1 | |
| 8/22/2025 | US | 4 | |
| 8/22/2025 | US | 1 | |
| 8/22/2025 | IE | 2 | |
| 8/6/2025 | US | 1 | |
| 8/6/2025 | US | 2 | |
| 8/6/2025 | IE | 1 | |
| 8/1/2025 | US | 2 |