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 1,583 failed authentication events, accounting for 46,825 messages. Activity spans from March 13, 2024 to May 22, 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 (16,073 failures), 52.212.19.177 (909 failures), 15.222.110.90 (393 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 1,583 failures, affecting 46,825 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 |