A high-performance subdomain scanner written in Go, utilizing the xReverseLabs Subdomain API for retrieving subdomains. This tool is optimized for speed using the fasthttp library and supports concurrent scanning, making it ideal for large-scale subdomain enumeration.

• Fast and Efficient: Leverages the fasthttp library for high-performance HTTP requests.
• Concurrent Scanning: Supports multi-threaded scanning to process multiple domains simultaneously.
• Customizable Output: Outputs the results to a specified file.
• Flexible Usage: Can scan from a single domain or a list of domains provided in a file.

• Go 1.16 is required to run this tool.

git clone https://github.com/xReverseLabs/SubRecon.git
cd SubRecon

go mod tidy

Before running the tool, you need to set up the config.json file with your API key.

{
    "apiKey": "YOUR_API_KEY_HERE"
}

Replace "YOUR_API_KEY_HERE" with your actual API key obtained from xReverseLabs.

• -f [file] : Path to the file containing a list of domains to scan.
• -d [domain] : A single domain to scan.
• -o [file] : Output file for saving the results (default: output.txt).
• -t [threads] : Number of concurrent threads to use (default: 5).
• --help : Display the help message with usage instructions.

Linux :
go run main.go -d example.com -o output.txt

Windows :
SubRecon-x64.exe -d example.com -o output.txt

This will scan example.com for subdomains and save the results in output.txt.

Linux :
go run main.go -f domains.txt -t 10 -o output.txt

Windows :
SubRecon-x64.exe -f domains.txt -t 10 -o output.txt

This will scan all domains listed in domains.txt with 10 concurrent threads and save the results in output.txt.

Linux :
go run main.go --help

Windows :
SubRecon-x64.exe --help

This will display a help message with information on how to use the tool.

The output file will contain the discovered subdomains, one per line, like this:

subdomain1.example.com
subdomain2.example.com
subdomain3.example.com
...

Only domains with subdomains will be included in the output file.

The tool is designed to be fast and efficient by utilizing the fasthttp library for HTTP requests and supporting concurrency. This makes it well-suited for scanning large numbers of domains quickly.

Contributions are welcome! If you have any ideas, suggestions, or bug reports, feel free to open an issue or submit a pull request.

This project is licensed under the MIT License. See the LICENSE file for details.

• fasthttp for the high-performance HTTP library.
• aurora for the beautiful terminal output colors.
• Yon3zu Developer

Feel free to reach out with any questions or suggestions!