Sub-Drill

Dependency-free shell script that finds subdomains from ~20 free online services, no API keys

Desktopfree

Sub-Drill is a small open-source shell script that collects subdomains for a domain from around twenty free public services. It needs no API keys or configuration and depends only on curl, so it can be piped into an existing reconnaissance workflow. It suits penetration testers and bug bounty hunters who want a quick passive subdomain list without setting up accounts.

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Problem & pain-point mapping
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What it's a strong alternative to
Trust & credibility signals

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