Attack Surface Scan vs tko-subs: side-by-side comparison (2026)

Attack Surface Scan: Agentless external attack surface monitoring with continuous change detection. Built by Attack Surface Scan.

tko-subs: A tool for detecting and taking over subdomains with dead DNS records.

The table above shows where their features, integrations, deployment and company size fit differ.

Attack Surface Scan is made by Attack Surface Scan. tko-subs is open-source with 766 GitHub stars. The vendor behind a product decides its roadmap, support, and longevity, so check each company's profile before you commit.

Often, yes. Attack Surface Scan and tko-subs are both External Attack Surface Management products, and both cover Subdomain Enumeration. Key differences: Attack Surface Scan is Commercial while tko-subs is Free, tko-subs is open-source. Use the table above to see where features, deployment and company size fit differ.