Shame on you, stupid spammers.. Sh4meful  DMARC Spoof Detection

Network: COGENT-A

This page shows DMARC authentication failures originating from the COGENT-A network. Learn more about this data.

Network Information
WHOIS Owner:
Cogent Communications, LLC
Countries:
BR DE CI US VE
Unique IPs:
5
CIDR:
38.0.0.0/8

Analysis

This network has contributed 5 unique IP addresses across 6 failed authentication events, accounting for 10 messages. Activity spans from October 7, 2024 to July 7, 2025, with peak volume in October 2024 (2 events). The top countries by failure volume are Ivory Coast (40%), United States (30%), Brazil (10%). The most active source IPs from this network include 38.91.100.225 (2 failures), 38.188.112.230 (1 failure), 38.254.108.74 (1 failure). Failures from COGENT-A, a commercial ISP, span 5 countries with no dominant source, which is consistent with forwarding infrastructure, relay services, or broadly distributed automated activity.

Failures Detected from this Network
Showing 1-6 of 6 failures, affecting 10 messages