altdns vs Zerocopter Recon: side-by-side comparison (2026)

altdns: A tool for generating permutations, alterations and mutations of subdomains and resolving them.

Zerocopter Recon: External attack surface mapping service to discover exposed digital assets. Built by Zerocopter.

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

altdns is open-source with 2,439 GitHub stars. Zerocopter Recon is made by Zerocopter. The vendor behind a product decides its roadmap, support, and longevity, so check each company's profile before you commit.

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