altdns vs Palo Alto Networks Cortex Xpanse: side-by-side comparison (2026)

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

Palo Alto Networks Cortex Xpanse: Active attack surface mgmt solution for discovering & remediating unknown risks. Built by Palo Alto Networks.

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

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

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