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Subdomain discoveryOpen Source

Subfinder

Passive subdomain discovery.

Fast passive subdomain discovery tool using many public sources for reconnaissance and asset discovery.

OSINTOpen SourceSource availableCommunity voting
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Overview

What Subfinder is good for

Fast passive subdomain discovery tool using many public sources for reconnaissance and asset discovery.

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Built for osint and vulnerability management workflows.

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Useful when evaluating subdomain discovery capabilities.

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Helpful for subdomains, dns, recon investigations and triage.

Evaluation guide

Quick decision notes

Best fit

Investigators collecting public web, domain, URL, identity, and infrastructure evidence.

Check before using

Confirm current pricing, data limits, account requirements, and licensing on the official site before production use.

Typical inputs

#subdomains · #dns · #recon

Discovery path

Use the categories, source links, and similar tools below to compare it with nearby options.

Use cases

Where it fits

Investigators collecting public web, domain, URL, identity, and infrastructure evidence.
Security teams prioritising vulnerabilities with exposure and real-world exploitation signals.
Teams finding exposed assets, technologies, services, and externally visible risk.

Classification

Categories and tags

OSINTVulnerability ManagementAttack Surface#subdomains#dns#recon

Sources

Official links and checks

Use these links to verify current plans, access requirements, documentation, releases, and support status.

Official websiteTracked visitGitHubTracked visit

Alternatives and related tools

Similar tools

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Shodan

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Wappalyzer

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Reviews

Community reviews and comments

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FAQ

Questions about Subfinder

What is Subfinder used for?

Subfinder is used for subdomain discovery workflows. Fast passive subdomain discovery tool using many public sources for reconnaissance and asset discovery.

Is Subfinder free?

The listed pricing model is Open Source. Check the official site for exact plan limits, usage restrictions, and current commercial terms.

Which teams should evaluate Subfinder?

It is most relevant to teams working across osint, vulnerability management, attack surface workflows.

What are alternatives to Subfinder?

Start with the similar tools section on this page. It highlights tools with overlapping categories, tags, and operational use cases.