DMARC Spoof Detection, China
Clear Clear FilterThis page shows DMARC authentication failures originating from China. Learn more about this data.
China accounts for 99 DMARC authentication failures observed by sh4meful over the observation window, sourced from 98 distinct IP addresses across 30 networks. This represents approximately 0.2% of total failure volume observed. Activity from China has declined over the last 30 days compared with the prior 30-day period. The most active source is CMNET with 15 failures across 15 IP addresses.
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Top Networks in China
Ten most active networks sourcing DMARC failures from China:
| Network | Organization | Failures | Distinct IPs | Top City |
|---|---|---|---|---|
| CMNET | — | 15 | 15 | Xi'an |
| BLUECLOUD | — | 19 | 19 | Shanghai |
| CHINANET-NM | — | 7 | 7 | — |
| CHINANET-SD | — | 1 | 1 | — |
| CHINANET-GD | — | 8 | 8 | Guangzhou |
| CHINANET-JS | — | 7 | 7 | Shenzhen |
| UNICOM-HL | — | 5 | 5 | — |
| UNICOM-SD | — | 3 | 3 | — |
| CHINANET-SH | — | 3 | 3 | Shanghai |
| CHINANET-AH | — | 3 | 3 | — |
CMNET and BLUECLOUD together account for 28% 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 June 8, 2026 with 23 failures recorded. Activity in the most recent 30-day window declined compared with the prior period (26 vs 43 failures).
Regional Context
Compared with peer geographies in Eastern Asia, China's failure volume is above the regional median. Countries in this region collectively contributed 1% of failures observed.
Failures
Showing 51-60 of 99 failures, affecting 159 messages| Date ▼ | Source IP | Country | City | Network | Messages |
|---|---|---|---|---|---|
| 2/9/2026 | CN China | 1 | |||
| 2/9/2026 | CN China | Tianjin | 1 | ||
| 12/19/2025 | CN China | Shanghai | 1 | ||
| 12/5/2025 | CN China | Beijing | 1 | ||
| 7/20/2025 | CN China | Guangzhou | 1 | ||
| 6/30/2025 | CN China | 1 | |||
| 6/27/2025 | CN China | 1 | |||
| 6/12/2025 | CN China | 4 | |||
| 6/3/2025 | CN China | Shenzhen | 1 | ||
| 4/21/2025 | CN China | Tianjin | 4 |
What This Means
Country-level patterns don't imply that mail from China 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.