DMARC Spoof Detection, Netherlands
Clear Clear FilterThis page shows DMARC authentication failures originating from Netherlands. Learn more about this data.
Netherlands accounts for 816 DMARC authentication failures observed by sh4meful over the observation window, sourced from 234 distinct IP addresses across 32 networks. This represents approximately 0.9% of total failure volume observed. Activity from Netherlands has increased over the last 30 days compared with the prior 30-day period. The most active source is Microsoft with 399 failures across 110 IP addresses.
816
234
32
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Top Networks in Netherlands
Ten most active networks sourcing DMARC failures from Netherlands:
| Network | Organization | Failures | Distinct IPs | Top City |
|---|---|---|---|---|
| MSFT | Microsoft | 399 | 110 | Amsterdam |
| UK-MICROSOFT-20060601 | Microsoft | 116 | 22 | Amsterdam |
| OTS549865 | — | 53 | 1 | Almere Stad |
| OMEGATECH | — | 50 | 8 | Amsterdam |
| GOOGL-2 | 45 | 42 | Groningen | |
| internet-secuirty-Zhongguanchun | — | 31 | 7 | Amsterdam |
| NETBLK-PACKETEXCHANGE-V4-09 | — | 8 | 2 | Amsterdam |
| HOSTP-7 | — | 9 | 2 | Amsterdam |
| RIPE-ERX-158-94-0-0 | — | 14 | 2 | Amsterdam |
| RO-M247RO-20050418 | — | 6 | 1 | Amsterdam |
Microsoft and Microsoft together account for 60% of failure volume from this country. Distribution across many networks is consistent with commodity spoofing infrastructure operating from this geography.
Failure Activity Over Time
Peak activity was observed in the week of April 27, 2026 with 32 failures recorded. Activity in the most recent 30-day window increased compared with the prior period (20 vs 17 failures).
Regional Context
Compared with peer geographies in Western Europe, Netherlands's failure volume is above the regional median. Countries in this region collectively contributed 2% of failures observed.
Failures
Showing 241-250 of 816 failures, affecting 910 messages| Date ▲ | Source IP | Country | City | Network | Messages |
|---|---|---|---|---|---|
| 5/2/2025 | NL The Netherlands | Amsterdam | 1 | ||
| 5/2/2025 | NL The Netherlands | Amsterdam | 1 | ||
| 5/2/2025 | NL The Netherlands | Amsterdam | 1 | ||
| 5/2/2025 | NL The Netherlands | Amsterdam | 1 | ||
| 5/2/2025 | NL The Netherlands | Amsterdam | 1 | ||
| 5/2/2025 | NL The Netherlands | Amsterdam | 2 | ||
| 5/2/2025 | NL The Netherlands | Amsterdam | 1 | ||
| 5/2/2025 | NL The Netherlands | Amsterdam | 1 | ||
| 5/2/2025 | NL The Netherlands | Amsterdam | 2 | ||
| 5/2/2025 | NL The Netherlands | Amsterdam | 1 |
What This Means
Country-level patterns don't imply that mail from Netherlands is inherently malicious. Many failures reflect misconfigured legitimate senders, forwarded messages that break authentication, or automated infrastructure operating without authorization. Domain owners investigating a specific failure should look at the source IP and network details rather than the country alone. Our DMARC guide explains how to interpret these signals in your own reports.