3subs is a CLI tool that automates subdomain enumeration using subfinder, assetfinder, and findomain. It merges and deduplicates results from all three tools for comprehensive coverage.

• Runs subfinder, assetfinder, and findomain automatically
• Merges and deduplicates subdomain results
• Simple CLI with progress banners
• Custom output filename with -o flag

• Go 1.18+
• macOS or Linux
• subfinder, assetfinder, and findomain installed and available in your PATH

You can install 3subs directly using Go (the binary will be named 3subs and typically placed in your $GOPATH/bin):

go install github.com/0x1Jar/3subs/cmd/3subs@latest

Or clone this repository and build the binary manually:

git clone https://github.com/0x1Jar/3subs.git
cd 3subs
go build -o 3subs ./cmd

After building the binary, you should move the 3subs binary to a directory that is in your $PATH for easy access:

sudo mv 3subs /usr/local/bin/

You can use the provided script to install all required tools (subfinder, assetfinder, findomain) on macOS/Linux:

zsh install_tools.sh

• This will install subfinder and assetfinder to $HOME/go/bin (ensure this is in your PATH).
• On macOS, findomain is installed via Homebrew to /usr/local/bin.
• On Linux, findomain is downloaded and placed in /usr/local/bin.

• If you get a command not found error for any tool, ensure $HOME/go/bin and /usr/local/bin are in your PATH.
• For Go tools: Add this to your shell profile (e.g., ~/.zshrc or ~/.bashrc):

  export PATH="$HOME/go/bin:$PATH"

• For Homebrew (macOS):

  export PATH="/usr/local/bin:$PATH"

3subs -d example.com -o myresults.txt

• Replace example.com with your target domain.
• Use -o to specify a custom output file for merged results (default: subdomains_all.txt).
• The results will be saved in:
  • subdomains_subfinder.txt
  • subdomains_assetfinder.txt
  • subdomain_find.txt
  • Merged and deduplicated results will be saved in your custom output file (default: subdomains_all.txt).

============================================
   3subs - Subdomain Enumeration Automation
   By: 0x1Jar (github.com/0x1Jar)
   This tool automates subdomain enumeration
   using subfinder, assetfinder, and findomain.
============================================
[~] Starting subdomain enumeration for: example.com
[>] Running subfinder...
[√] subfinder done.
[>] Running assetfinder...
[√] assetfinder done.
[>] Running findomain...
[√] findomain done.
[>] Merging results and removing duplicates...
[√] Merge complete.
[✓] Subdomain enumeration completed in 2.3s.

MIT