DMARC Spoof Detection, Australia
Clear Clear FilterThis page shows DMARC authentication failures originating from Australia. Learn more about this data.
Australia accounts for 75 DMARC authentication failures observed by sh4meful over the observation window, sourced from 49 distinct IP addresses across 18 networks. This represents approximately 0.1% of total failure volume observed. Activity from Australia has declined over the last 30 days compared with the prior 30-day period. The most active source is Microsoft with 27 failures across 27 IP addresses.
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Top Networks in Australia
Ten most active networks sourcing DMARC failures from Australia:
| Network | Organization | Failures | Distinct IPs | Top City |
|---|---|---|---|---|
| MSFT | Microsoft | 27 | 27 | Sydney |
| AT-88-Z | Amazon | 15 | 1 | Sydney |
| HO-2 | — | 7 | 3 | Sydney |
| OPTUSCOM-AU | — | 2 | 1 | Brisbane |
| OPTUSINTERNET-AU | — | 5 | 1 | Brisbane |
| TELSTRA-AU | — | 4 | 2 | Sydney |
| IINET-AU | — | 1 | 1 | Melbourne |
| MIMECAST-AU | Mimecast | 3 | 2 | — |
| Exetel-VIC-DSL | — | 1 | 1 | Melbourne |
| SPIRIT-TELECOM-AU | — | 1 | 1 | Melbourne |
Microsoft and Amazon together account for 48% 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 15, 2026 with 2 failures recorded. Activity in the most recent 30-day window declined sharply compared with the prior period (0 vs 2 failures).
Regional Context
Compared with peer geographies in Australia and New Zealand, Australia's failure volume is above the regional median. Countries in this region collectively contributed 0% of failures observed.
Failures
Showing 31-40 of 75 failures, affecting 96 messages| Date ▼ | Source IP | Country | City | Network | Messages |
|---|---|---|---|---|---|
| 6/27/2025 | AU Australia | Sydney | 1 | ||
| 6/25/2025 | AU Australia | Sydney | 1 | ||
| 6/19/2025 | AU Australia | Sydney | 1 | ||
| 6/13/2025 | AU Australia | Sydney | 1 | ||
| 5/28/2025 | AU Australia | Sydney | 1 | ||
| 5/10/2025 | AU Australia | Melbourne | 4 | ||
| 5/9/2025 | AU Australia | Sydney | 1 | ||
| 5/2/2025 | AU Australia | Sydney | 1 | ||
| 3/28/2025 | AU Australia | Sydney | 1 | ||
| 3/24/2025 | AU Australia | Perth | 2 |
What This Means
Country-level patterns don't imply that mail from Australia 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.