Subx: The C++ Subdomain Sniffer You Didn’t Know You Needed (Until Now)
Let’s face it. The internet is full of secrets, most of which are hiding right in the open. Like your forgotten .devsubdomain that’s still running on a 2017 version of WordPress.
Welcome to Subx, the unapologetically fast, C++-powered subdomain enumeration tool that helps you find what your infrastructure forgot.
What Exactly Is Subx?
Subx is an open-source, subdomain enumeration tool written entirely in C++. That means:
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No Python virtual environments.
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No dependency rabbit holes.
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No “ModuleNotFoundError” tantrums.
Just you, your terminal, and a tool that means business.
Why Are Subdomains Even Dangerous?
Because attackers love the path of least resistance. They’re not always looking to crack your main domain fortress; they’re poking around your abandoned side doors, like:
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test.example.com (still using
admin:admin) -
beta.api.example.com (that forgot to use HTTPS)
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staging-login.example.com (spoiler: it’s in production now)
Subdomains are like stray cats—if you don’t keep track of them, they’ll come back with friends.
How Subx Helps
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Blazing Fast: Written in C++ because milliseconds matter.
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Multi-Source Scanning: Pulls from known sources like
crt.sh,Wayback, and more. -
Quiet or Chatty: Use verbose mode when you want tea, or silent mode when you want stealth.
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Easy to Use: One binary, zero excuses.
But What About Safety?
No shady calls. No phoning home. Subx is open-source because transparency is the first step to security. (Also because I want pull requests.)
How to Stay One Step Ahead
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Run Subx on your domains weekly—like brushing your digital teeth.
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Pipe results into your favorite scanner (Nikto, Nuclei, whatever makes you feel safe).
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Automate it if you’re fancy. Cron jobs aren’t just for sysadmins anymore.
Want to Help?
Fork it. Test it. Send PRs. Or just star the repo to let me know I’m not yelling into the void.
Subx is for red teamers, blue teamers, and that one DevSecOps person who’s in 12 Slack channels and hasn’t blinked in 2 days.
You’re all welcome here.
Try Subx. Catch the stray subdomains before they catch you.
cysectools.com
