DMARC Spoof Detection, Brazil
Clear Clear FilterThis page shows DMARC authentication failures originating from Brazil. Learn more about this data.
Brazil accounts for 145 DMARC authentication failures observed by sh4meful over the observation window, sourced from 133 distinct IP addresses across 89 networks. This represents approximately 0.4% of total failure volume observed. Activity from Brazil has declined over the last 30 days compared with the prior 30-day period. The most active source is Claro NXT Telecomunicacoes Ltda with 18 failures across 17 IP addresses.
145
133
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Top Networks in Brazil
Ten most active networks sourcing DMARC failures from Brazil:
| Network | Organization | Failures | Distinct IPs | Top City |
|---|---|---|---|---|
| Claro NXT Telecomunicacoes Ltda | — | 18 | 17 | São Paulo |
| TELEFÔNICA BRASIL S.A | — | 3 | 3 | Regente Feijó |
| BRISANET SERVICOS DE TELECOMUNICACOES S.A | — | 4 | 4 | Maceió |
| ACESSOLINE TELECOMUNICA??ES LTDA | — | 6 | 5 | São José dos Pinhais |
| MUNDIVOX DO BRASIL LTDA | — | 4 | 3 | Rio de Janeiro |
| H NET SERVICOS DE COMUNICACAO E TECNOLOGIA LTDA | — | 1 | 1 | Lajedo |
| A & G Serviços em TI | — | 1 | 1 | Brasília |
| Alares Cabo Servicos de Telecomunicacoes S.A. | — | 3 | 3 | Taboão da Serra |
| JOSE CARLOS GONZAGA CARDOSO - ME | — | 2 | 2 | Rio de Janeiro |
| V tal | — | 2 | 2 | Joinville |
Claro NXT Telecomunicacoes Ltda and TELEFÔNICA BRASIL S.A together account for 20% 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 38 failures recorded. Activity in the most recent 30-day window declined sharply compared with the prior period (24 vs 56 failures).
Regional Context
Compared with peer geographies in South America, Brazil's failure volume is above the regional median. Countries in this region collectively contributed 1% of failures observed.
Failures
Showing 111-120 of 145 failures, affecting 429 messages| Date ▲ | Source IP | Country | City | Network | Messages |
|---|---|---|---|---|---|
| 6/2/2026 | BR Brazil | Foz do Iguaçu | 1 | ||
| 6/3/2026 | BR Brazil | Foz do Iguaçu | 2 | ||
| 6/3/2026 | BR Brazil | Foz do Iguaçu | 1 | ||
| 6/9/2026 | BR Brazil | Cruz Alta | 1 | ||
| 6/11/2026 | BR Brazil | Cláudio | 4 | ||
| 6/14/2026 | BR Brazil | Aracaju | 4 | ||
| 6/14/2026 | BR Brazil | Montes Claros | 4 | ||
| 6/15/2026 | BR Brazil | Porto Real do Colégio | N/A | 4 | |
| 6/15/2026 | BR Brazil | São Miguel do Iguaçu | N/A | 4 | |
| 6/16/2026 | BR Brazil | Porto Alegre | 1 |
What This Means
Country-level patterns don't imply that mail from Brazil 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.