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.
# download release from https://github.com/projectdiscovery/subfinder/releases/tar -xzvf subfinder-linux-amd64.tar.gzmv 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.
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.
Pros of subfinder over sublist3r: As subfinder is a Go Tool and sublist3r is a python tool and Go Language is faster than python and also Go language’s approach to concurrency is very easy to work with. Also, subfinder also provides various options that sublist3r doesn’t.
Subfinder is a popular open-source tool used for subdomain enumeration. It allows users to quickly and easily discover subdomains of a given domain by using a variety of different active and passive methods. This can be useful for a variety of purposes, such as security assessments, penetration testing, and research.
Subfinder is built for one thing - passive subdomain enumeration, and it does that very well. Subfinder complies with all the passive source licenses and usage restrictions for its sources.
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Subdomain enumeration is the process of identifying all subdomains for a. given domain. This can be useful for a variety of purposes, such as. identifying potential targets for an attack, or simply for organizational. purposes.
A subdomain is a prefix added to a domain name to separate a section of your website. Site owners primarily use subdomains to manage extensive sections that require their own content hierarchy, such as online stores, blogs, job boards or support platforms. Subdomains function as a separate website from its domain.
Sublist3r is a python tool designed to enumerate subdomains of websites using OSINT. It helps penetration testers and bug hunters collect and gather subdomains for the domain they are targeting. Sublist3r enumerates subdomains using many search engines such as Google, Yahoo, Bing, Baidu and Ask.
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