ArchivedNo longer active, data collection ran March 2024 to September 2026|9,442 records|3,409 source IPs|138 countriesAbout this archive
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:
BRDECIUSVE
Unique IPs:
6
CIDR:
38.0.0.0/8

Analysis

This network has contributed 6 unique IP addresses across 7 failed authentication events, accounting for 13 messages. Activity spans from October 7, 2024 to June 28, 2026, with peak volume in October 2024 (2 events). The top countries by failure volume are Brazil (31%), Ivory Coast (31%), United States (23%). The most active source IPs from this network include 38.91.100.225 (2 failures), 38.188.112.230 (1 failure), 38.225.90.7 (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 1-7 of 7 failures, affecting 13 messages
Date โ–ผ Source IP Country Messages
6/28/2026 38.225.90.7 BR3
7/7/2025 38.56.74.215 BR1
4/5/2025 38.26.139.40 CI4
11/22/2024 38.254.108.74 VE1
11/13/2024 38.188.112.230 DE1
10/8/2024 38.91.100.225 US2
10/7/2024 38.91.100.225 US1