DMARC Spoof Detection, South Korea
Clear Clear FilterThis page shows DMARC authentication failures originating from South Korea. Learn more about this data.
South Korea accounts for 74 DMARC authentication failures observed by sh4meful over the observation window, sourced from 51 distinct IP addresses across 9 networks. This represents approximately 0.2% of total failure volume observed. Activity from South Korea has held roughly steady over the last 30 days. The most active source is KORNET-KR with 26 failures across 21 IP addresses.
74
51
9
173
Top Networks in South Korea
Ten most active networks sourcing DMARC failures from South Korea:
| Network | Organization | Failures | Distinct IPs | Top City |
|---|---|---|---|---|
| KORNET-KR | — | 26 | 21 | Bupyeong-gu |
| HANKOOK-TIRE-NETWORK-KR | — | 8 | 2 | — |
| BORANET-KR | — | 4 | 4 | Suncheon |
| UK-MICROSOFT-20060601 | Microsoft | 13 | 8 | Busan |
| Xpeed-KR | — | 3 | 3 | Gwangmyeong |
| broadNnet-KR | — | 3 | 3 | Nowon-gu |
| MSFT | Microsoft | 7 | 7 | Seoul |
| SCLOUDPTELTD-SG | — | 3 | 1 | — |
| NTTA-140-174 | — | 1 | 1 | Seoul |
KORNET-KR and HANKOOK-TIRE-NETWORK-KR together account for 57% 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 4 failures recorded. Activity in the most recent 30-day window held roughly steady compared with the prior period (0 vs 0 failures).
Regional Context
Compared with peer geographies in Eastern Asia, South Korea's failure volume is above the regional median. Countries in this region collectively contributed 1% of failures observed.
Failures
Showing 11-20 of 74 failures, affecting 173 messages| Date ▼ | Source IP | Country | City | Network | Messages |
|---|---|---|---|---|---|
| 9/29/2025 | KR South Korea | Haeundae-gu | 4 | ||
| 9/23/2025 | KR South Korea | Seoul | 1 | ||
| 9/18/2025 | KR South Korea | Seoul | 1 | ||
| 9/11/2025 | KR South Korea | Seoul | 1 | ||
| 9/3/2025 | KR South Korea | Seoul | N/A | 1 | |
| 7/30/2025 | KR South Korea | Seoul | N/A | 1 | |
| 7/20/2025 | KR South Korea | Daejeon | 4 | ||
| 7/8/2025 | KR South Korea | Namyangju | 1 | ||
| 7/3/2025 | KR South Korea | Seongnam-si | 2 | ||
| 7/3/2025 | KR South Korea | Yongin-si | 1 |
What This Means
Country-level patterns don't imply that mail from South Korea 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.