Security tool · recon
subfinder
Fast passive subdomain enumeration that aggregates 30+ public sources. The default first step of almost every recon workflow.
Overview
Where subfinder fits
Fast passive subdomain enumeration that aggregates 30+ public sources. The default first step of almost every recon workflow.
Detection-first use
Start with the least intrusive template that can distinguish your hypothesis from a normal response. Preserve raw output and a negative control.
Install
Installation references
Install with goAuthorization required
go install -v github.com/projectdiscovery/subfinder/v2/cmd/subfinder@latest- Positive signal
- Tool-specific output that supports the stated hypothesis.
- Negative control
- No result, or identical behavior against a known-safe control.
- Intrusiveness
- Review flags and target scope before execution.
Install with brewAuthorization required
brew install subfinder- Positive signal
- Tool-specific output that supports the stated hypothesis.
- Negative control
- No result, or identical behavior against a known-safe control.
- Intrusiveness
- Review flags and target scope before execution.
Install with pdtmAuthorization required
pdtm -i subfinder- Positive signal
- Tool-specific output that supports the stated hypothesis.
- Negative control
- No result, or identical behavior against a known-safe control.
- Intrusiveness
- Review flags and target scope before execution.
Test safely
Command templates
Passive enum → fileAuthorization required
Populate placeholders only with assets that are explicitly in scope.
subfinder -d {domain} -all -recursive -o {output}- Positive signal
- Tool-specific output that supports the stated hypothesis.
- Negative control
- No result, or identical behavior against a known-safe control.
- Intrusiveness
- Review flags and target scope before execution.
Silent (pipe-friendly)Authorization required
Populate placeholders only with assets that are explicitly in scope.
subfinder -d {domain} -all -silent- Positive signal
- Tool-specific output that supports the stated hypothesis.
- Negative control
- No result, or identical behavior against a known-safe control.
- Intrusiveness
- Review flags and target scope before execution.
Related
Continue the workflow
Sources
Attribution and verification
Version history: normalized permanent page created 2026-08-20. Upstream activity and popularity are separate signals and do not establish tool safety.