Sh4mefulNetwork: AT-88-Z
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 AT-88-Z network. Learn more about this data.
Analysis
This network has contributed 59 unique IP addresses across 1,652 failed authentication events, accounting for 47,988 messages. Activity spans from March 13, 2024 to June 24, 2026, with peak volume in September 2025 (2,574 events). The top countries by failure volume are United States (93%), Ireland (5%), Canada (2%). The most active source IPs from this network include 35.174.145.124 (16,534 failures), 52.212.19.177 (926 failures), 15.222.110.90 (402 failures). A single IP dominates activity from AT-88-Z (Amazon), suggesting a concentrated or persistent source rather than distributed infrastructure.
Failures Detected from this Network
Showing 1,051-1,100 of 1,652 failures, affecting 47,988 messages| Date ▼ | Source IP | Country | Messages |
|---|---|---|---|
| 4/30/2025 | US | 3 | |
| 4/30/2025 | US | 1 | |
| 4/30/2025 | IE | 2 | |
| 4/30/2025 | US | 1 | |
| 4/30/2025 | US | 1 | |
| 4/25/2025 | GB | 1 | |
| 4/25/2025 | CA | 3 | |
| 4/25/2025 | US | 3 | |
| 4/25/2025 | US | 2 | |
| 4/25/2025 | US | 86 | |
| 4/25/2025 | US | 2 | |
| 4/25/2025 | IE | 16 | |
| 4/23/2025 | CA | 7 | |
| 4/23/2025 | US | 78 | |
| 4/23/2025 | IE | 7 | |
| 4/19/2025 | DE | 2 | |
| 4/18/2025 | CA | 7 | |
| 4/18/2025 | US | 95 | |
| 4/18/2025 | US | 2 | |
| 4/18/2025 | US | 1 | |
| 4/18/2025 | IE | 8 | |
| 4/18/2025 | US | 1 | |
| 4/16/2025 | GB | 1 | |
| 4/16/2025 | CA | 2 | |
| 4/16/2025 | US | 1 | |
| 4/16/2025 | US | 1 | |
| 4/16/2025 | US | 73 | |
| 4/16/2025 | IE | 11 | |
| 4/11/2025 | US | 3 | |
| 4/11/2025 | US | 2 | |
| 4/11/2025 | US | 1 | |
| 4/11/2025 | US | 39 | |
| 4/11/2025 | IE | 9 | |
| 4/10/2025 | CA | 5 | |
| 4/10/2025 | US | 38 | |
| 4/10/2025 | IE | 4 | |
| 3/28/2025 | AU | 1 | |
| 3/28/2025 | GB | 2 | |
| 3/28/2025 | CA | 13 | |
| 3/28/2025 | US | 3 | |
| 3/28/2025 | IN | 2 | |
| 3/28/2025 | DE | 1 | |
| 3/28/2025 | US | 2 | |
| 3/28/2025 | US | 3 | |
| 3/28/2025 | US | 3 | |
| 3/28/2025 | US | 531 | |
| 3/28/2025 | US | 3 | |
| 3/28/2025 | US | 1 | |
| 3/28/2025 | US | 3 | |
| 3/28/2025 | US | 2 |