subfinder tools for linux

subfinder is a subdomain discovery tool that returns valid subdomains for websites, using passive online sources. It has a simple, modular architecture and is optimized for speed. subfinder is built for doing one thing only - passive subdomain enumeration, and it does that very well.

We have made it to comply with all the used passive source licenses and usage restrictions. The passive model guarantees speed and stealthiness that can be leveraged by both penetration testers and bug bounty hunters alike.

Features

Fast and powerful resolution and wildcard elimination modules
Curated passive sources to maximize results
Multiple output formats supported (JSON, file, stdout)
Optimized for speed and lightweight on resources
STDIN/OUT support enables easy integration into workflows
Installation
subfinder requires go1.24 to install successfully. Run the following command to install the latest version:

1. copy url and past terminal command -- go install -v github.com/projectdiscovery/subfinder/v2/cmd/subfinder@latest

Learn about more ways to install subfinder here: https://docs.projectdiscovery.io/tools/subfinder/install.
2 copy and past terminal -- subfinder -h
Subfinder is a tool used for discovering valid subdomains of websites through passive online sources. It is commonly utilized by ethical hackers and bug bounty hunters during the reconnaissance phase of security assessments

subfinder Tool in Linux

subfinder is a subdomain enumeration tool written in the Go programming language. Subfinder is used for discovering passive subdomains of websites by using digital sources like Censys, Chaos, Recon.dev, Shodan, Spyse, Virustotal, and many other passive online sources. Subfinder is widely used by Ethical Hackers and Bug bounty hunters in the Information gathering Phase which is also known as Reconnaissance.

Installing subfinder

As subfinder is a Go tool you need to have the Go language package installed before installing subfinder.

1. From Source(Recommended)

All you need to do is open your terminal and paste this one line of code and press enter.
```
GO111MODULE=on go get -v github.com/projectdiscovery/subfinder/v2/cmd/subfinder
```
From Source

2. From Binary

Firstly download the release suitable for your OS from https://github.com/projectdiscovery/subfinder/releases/ and then unzip the folder and move the subfinder binary file to /usr/local/bin/ and you are good to go
```
# download release from https://github.com/projectdiscovery/subfinder/releases/
tar -xzvf subfinder-linux-amd64.tar.gz
mv subfinder /usr/local/bin/
subfinder -h
```
3. From Github

Clone https://github.com/projectdiscovery/subfinder.git repository and change directory to subfinder/v2/cmd/subfinder and then type go build . (don't forget to put a '.' at the end ) now move the subfinder binary file to /usr/local/bin and subfinder is ready to use.
```
git clone https://github.com/projectdiscovery/subfinder.git
cd subfinder/v2/cmd/subfinder
go build .
mv subfinder /usr/local/bin/
subfinder -h
```
From Github

Retrieving the Subfinder list of attributes
```
subfinder -h 
```
Working with SubFinder

Here we will find out subdomains of the domain geeksforgeeks.org and setting a concurrency of 50. I got around 73 subdomains for geeksforgeeks.org in 4 seconds 71 milliseconds.
```
subfinder -d geeksforgeeks.org -silent -t 50
```
Example usage of subfinder