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SecArsenal
Educational and ethical use only. Only test systems you own or are explicitly authorized to test. Full disclaimer.

Subfinder (T)

Fast passive subdomain discovery utility that aggregates results from many curated OSINT and API-backed sources.

cloud-infrastructure
Official docs ↗

Platforms: Web · Last verified September 7, 2026

Fast passive subdomain discovery utility that aggregates results from many curated OSINT and API-backed sources.

Only use this tool against systems you own or are explicitly authorized to test — see the disclaimer.

Getting started

Best for: Passive subdomain enumeration for cloud asset inventorying. See the official site linked above for details.