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Subfinder: Subdomain enumeration tool


Subfinder: Subdomain enumeration tool

Hello Friends, in this blog we are going to learn about the subdomain enumeration tool subfinder

Subfinder is a subdomain enumeration tool that finds the valid subdomain of the website. It finds the subdomain with passive enumeration. This tool is very helpful for Web application pentester and Bug Bounty hunter. It has a lot of features and is easy to use.


  • Fast and powerful resolution and wildcard elimination module
  • Curated passive sources to maximize results
  • Multiple Output formats supported (Json, File, Stdout)
  • Optimized for speed, very fast and lightweight on resources
  • STDIN/OUT support for integrating in workflows


Subfinder requires go1.17 to install successfully.

Go lang Installation

Open the url and download go lang from an official source

go to the Download directory and run the following command to extract in usr local directory
run command:-  Sudo tar -C /usr/local/ -xzf go1.18.1.linux-amd64.tar.gz

Now we need to edit the zashrc file, open the zashrc file in any text editor, and in the end paste the below 3 lines

$ sudo nano ~/.zshrc

export GOROOT=/usr/local/go
export GOPATH=$HOME/go
export PATH=$GOPATH/bin:$GOROOT/bin:$PATH

Refresh the Zashrc file by using this command: source ~/.zshrc

Golang tool installed successfully, now we can install subfinder with 1 command

Subfinder requires go1.17 to install successfully. Run the following command to get the repo –

go install -v

Subfinder Usage

# subfinder -h

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

To run the tool on a target, just use the following command.

We can save this result in any file by using the below command

Author: Harnam Singh is an Infosec Analyst and Penetration Tester. Can be Contacted  on LinkedIn

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