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Installation and use of subfinder

What is subfinder?

Subfinder is a subdomain discovery tool that is part of the Kali Linux toolkit. It is designed to find valid subdomains for websites by using passive online sources and APIs. This tool is widely used in the reconnaissance phase of penetration testing, as it helps in identifying potential entry points in a target domain by discovering its subdomains.

Uses of Subfinder in Kali Linux:

  • Subdomain Enumeration: Subfinder scans various data sources to gather a comprehensive list of subdomains associated with a target domain. This is crucial for understanding the attack surface of a domain.

  • Passive Scanning: Unlike active scanning tools, Subfinder primarily relies on passive sources, meaning it gathers information without directly interacting with the target domain. This reduces the risk of detection by the target.

  • Integration with Other Tools: Subfinder can be used in combination with other tools like Amass or Assetfinder to enhance subdomain discovery efforts. It can also output results in formats compatible with other tools for further analysis.

  • API Integration: The tool supports various APIs (e.g., VirusTotal, Shodan, and Censys) to improve its discovery capabilities. By configuring API keys, users can leverage these services for more extensive subdomain enumeration.

  • Automation in Reconnaissance Workflows: 

    Subfinder can be easily integrated into automated reconnaissance workflows. It can be scripted to run periodically or as part of a CI/CD pipeline to keep track of subdomain changes over time.

first we need go lang  for the installation if you don't have go lang then read  blog :Installation and use of go

Steps for install subfinder:

  • type go install -v github.com/projectdiscovery/subfinder/v2/cmd/subfinder@latest in terminal for install subfinder.
  • then type cd go/bin/
  • then type sudo mv subfinder /usr/local/bin/ 
  • then type subfinder -h for help menu of subfinder.
  • then type subfinder -d geeksforgeeks.org

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