Subfinder: Subdomain finder

Find all subdomains of a page easily and quickly

subfinder is a subdomain discovery tool that returns the most authoritative results for websites according to a survey I did of programs of its kind using online sources. It has a simple, modular architecture and is optimized for maximum . It is open source and does not make noise on the network. Mainly used by penetration testers and bug bounty hunters.

subfinder run


  • Fast for immediate results
  • Many sources for better results
  • Support multiple output formats (JSON, file, stdout)
  • It does not consume a lot of system resources
  • Easy integration into workflows


go install -v


subfinder -h

This will display help for the tool. Here are all the switches it supports.

  ./subfinder [flags]

  -d, -domain string[]  domains to find subdomains for
  -dL, -list string     file containing list of domains for subdomain discovery

  -s, -sources string[]           specific sources to use for discovery (-s crtsh,github). Use -ls to display all available sources.
  -recursive                      use only sources that can handle subdomains recursively (e.g. subdomain.domain.tld vs domain.tld)
  -all                            use all sources for enumeration (slow)
  -es, -exclude-sources string[]  sources to exclude from enumeration (-es alienvault,zoomeye)

  -m, -match string[]   subdomain or list of subdomain to match (file or comma separated)
  -f, -filter string[]   subdomain or list of subdomain to filter (file or comma separated)

  -rl, -rate-limit int  maximum number of http requests to send per second
  -t int                number of concurrent goroutines for resolving (-active only) (default 10)

   -up, -update                 update subfinder to latest version
   -duc, -disable-update-check  disable automatic subfinder update check

  -o, -output string       file to write output to
  -oJ, -json               write output in JSONL(ines) format
  -oD, -output-dir string  directory to write output (-dL only)
  -cs, -collect-sources    include all sources in the output (-json only)
  -oI, -ip                 include host IP in output (-active only)

  -config string                flag config file (default "$HOME/.config/subfinder/config.yaml")
  -pc, -provider-config string  provider config file (default "$HOME/.config/subfinder/provider-config.yaml")
  -r string[]                   comma separated list of resolvers to use
  -rL, -rlist string            file containing list of resolvers to use
  -nW, -active                  display active subdomains only
  -proxy string                 http proxy to use with subfinder
  -ei, -exclude-ip              exclude IPs from the list of domains

  -silent             show only subdomains in output
  -version            show version of subfinder
  -v                  show verbose output
  -nc, -no-color      disable color in output
  -ls, -list-sources  list all available sources

  -timeout int   seconds to wait before timing out (default 30)
  -max-time int  minutes to wait for enumeration results (default 10)

Video guide


Usage example

subfinder -d

               __    _____           __         
   _______  __/ /_  / __(_)___  ____/ /__  _____
  / ___/ / / / __ \/ /_/ / __ \/ __  / _ \/ ___/
 (__  ) /_/ / /_/ / __/ / / / / /_/ /  __/ /    
/____/\__,_/_.___/_/ /_/_/ /_/\__,_/\___/_/ v2.4.9

Use with caution. You are responsible for your actions
Developers assume no liability and are not responsible for any misuse or damage.
By using subfinder, you also agree to the terms of the APIs used.

[INF] Enumerating subdomains for

[INF] Found 18 subdomains for in 3 seconds 672 milliseconds

Discovered subdomains can also be used in other tools. For example, you can send subdomains to httpx, which will then find HTTP servers running on the host.

echo | subfinder -silent | httpx -silent

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Written by Anastasis Vasileiadis

Translations are like women. When they are beautiful they are not faithful and when they are faithful they are not beautiful.

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