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 1,545 failed authentication events, accounting for 46,430 messages. Activity spans from March 13, 2024 to April 14, 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 (15,911 failures), 52.212.19.177 (901 failures), 15.222.110.90 (390 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 1-50 of 1,545 failures, affecting 46,430 messages| Date ▲ | Source IP | Country | Messages |
|---|---|---|---|
| 3/13/2024 | GB | 2 | |
| 3/13/2024 | CA | 4 | |
| 3/13/2024 | US | 3 | |
| 3/13/2024 | US | 1 | |
| 3/13/2024 | US | 1 | |
| 3/13/2024 | US | 1 | |
| 3/13/2024 | US | 367 | |
| 3/13/2024 | US | 2 | |
| 3/13/2024 | US | 6 | |
| 3/13/2024 | US | 7 | |
| 3/13/2024 | IE | 18 | |
| 3/13/2024 | US | 2 | |
| 3/13/2024 | US | 4 | |
| 3/24/2024 | US | 1 | |
| 3/27/2024 | US | 1 | |
| 3/31/2024 | US | 1 | |
| 4/17/2024 | US | 1 | |
| 4/17/2024 | US | 2 | |
| 4/17/2024 | US | 1 | |
| 4/17/2024 | US | 115 | |
| 4/17/2024 | US | 2 | |
| 4/17/2024 | US | 1 | |
| 4/17/2024 | IE | 4 | |
| 4/18/2024 | US | 1 | |
| 4/22/2024 | US | 1 | |
| 5/10/2024 | US | 3 | |
| 5/10/2024 | US | 1 | |
| 5/10/2024 | US | 2 | |
| 5/10/2024 | US | 119 | |
| 5/10/2024 | US | 1 | |
| 5/10/2024 | US | 3 | |
| 5/10/2024 | US | 1 | |
| 5/10/2024 | IE | 4 | |
| 5/10/2024 | US | 1 | |
| 5/31/2024 | US | 1 | |
| 5/31/2024 | US | 1 | |
| 5/31/2024 | US | 1 | |
| 5/31/2024 | US | 124 | |
| 5/31/2024 | US | 2 | |
| 5/31/2024 | US | 3 | |
| 5/31/2024 | US | 1 | |
| 5/31/2024 | IE | 5 | |
| 6/12/2024 | US | 1 | |
| 6/12/2024 | US | 1 | |
| 6/12/2024 | US | 2 | |
| 6/12/2024 | US | 2 | |
| 6/12/2024 | US | 123 | |
| 6/12/2024 | US | 1 | |
| 6/12/2024 | US | 4 | |
| 6/12/2024 | IE | 3 |