Findomain
Operator: Eduard Tolosa and contributors, Colombia
Local subdomain search with DNS resolution, result import and monitoring for new subdomains.
Technical Infrastructure
Product
Findomain, a freely available open-source CLI. A previously mentioned premium offering is not presented as a current plan or a separate web service.
Availability and source date
Active
As of: 16 October 2026.
No functionality test has been performed.
Use in OSINT research
Collects subdomains for a known domain and can resolve them or report new findings in later runs. External sources and active checks remain distinct.
Queries
| Input | Result | Result type |
|---|---|---|
| Domain / website | Subdomains found in Certificate Transparency data and configured external sources. | Retrieved |
| Domain / website | Resolved IP addresses and filtered reachable subdomains. | Technical check according to provider |
| Domain / website | New subdomains compared with previously saved results. | Retrieved |
Features
- Collects subdomains from certificate data and external data sources.
- Resolves discovered subdomains to IP addresses.
- Imports results from other subdomain tools.
- Saves results and detects new subdomains in subsequent runs.
- Can report new findings through Discord, Slack or Telegram webhooks.
Categories
- Technical Infrastructure
- DNS
Coverage
Dataset
No regional dataset of its own. The specified target sites and configured data sources determine the results.
Access
Installation and deployment
Locally installable
Local CLI or CLI container. The database and scheduling can run on your own infrastructure; no dedicated Findomain web server is described in the guide reviewed.
Requirements
Locally installable binaries or Docker; building from source uses Rust. Some sources require their own keys. Repeated monitoring runs require an external schedule, such as Cron.
Export
TXT result files. Monitoring data in SQLite or PostgreSQL, depending on the version and configuration. TOML/JSON/YAML configuration files are not a results API.
Provider
Eduard Tolosa and contributors
Country of establishment
Colombia
Interfaces
No API, MCP or AI integration is documented.
Maintenance
Licence
GPL-3.0
Latest activity
Commit 09/2026
Stars
approx. 3,800 (as of 16 October 2026)
Legal note
Limitations
- External sources have their own keys, limits and data gaps.
- DNS resolution and additional checking modules may contact the target infrastructure.
- The current repository documentation also describes version 11 (beta); package managers may still provide the stable version 10.0.1.
Guides and practical reports
Official · Findomain: installation and subdomain monitoring
Findomain-Projekt · EN
Explains local installation, data source keys, databases and external scheduling.